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Pearson Edexcel International GCSE Mathematics B (4MB1) · single Higher tier · Pearson Edexcel ·

Integer powers, derivative notation and original domains

Differentiate integer-power terms with exact signed coefficients, retain original domains and independently interpret the derivative at a named input.

Pearson4MB1 · integer-power differentiation and original domains · single Higher tier · Mathematics B 4L
Exam scope and assessment notes

Original integer-power differentiation teaching with four stages and twelve tasks. Each displayed original term has actual coefficient, old-power, coefficient-times-power and lowered-power working. Constants use an explicit zero derivative without a spurious reciprocal. Reciprocals, fractional and negative coefficients, powers beyond cubics, sums, cancellation and original zero exclusions are retained. The learner enters a combined derivative and named-input substitution, then independent final expression, notation, value, rate unit, mathematical-domain and model-context decisions. Exact rational comparison accepts reordered and equivalent supported expressions without repairing original or added domain holes. The general integer-power rule is taught; the finite checker bounds are tool limits rather than syllabus exclusions. Complete wrong attempts can study an explanation without passing. The complete checked4Lteaching/practice bundle has a structural source link;All14Functions source rows have reviewed structural teaching/practice links;other Mathematics B source gaps remain explicit in the current course map. Source mapping is separate from specialist and formal assessment approval. No4Mstationary/turning-point or4Nmotion completion is inherited. Written reasoning, model validity and specialist review remain pending. No official marks, mastery or formal assessment readiness. Single Higher-tier linear4MB1, entry context2026/27only. BookISBN9780435044107 is metadata only; no verified full book body, chapter/Hub map or MathematicsA/Foundation/modular inheritance.

Before you begin

  • Signed rational arithmetic and integer powers
  • Rewriting reciprocal terms with negative powers
  • Function notation and original mathematical domains

Work on paper. Try each question before revealing help, and explain why your method works.

Quick readiness check

What is the derivative of a constant term such as -5?

What you will learn

  • Apply the coefficient-times-integer-power rule and handle constants explicitly.
  • Differentiate sums and reciprocal powers, including exact fractional and negative coefficients.
  • Write the derivative with the correct dependent and input variable notation.
  • Keep original reciprocal exclusions after cancellation and distinguish derivative expressions from evaluated rates.
  • Record actual term working and separate final expression, value, units, mathematical-domain and model-context decisions.

Integer-power differentiation: Worked

Show how each original term changes, combine your derivative, and substitute into that derivative. Record your working and a separate interpretation before comparing or studying the explanation. These fixed comparisons support self-checking; they do not award marks or mastery.

Task 1: differentiate the original terms

y = (3) · x4

Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = 2 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula.

Given input: x = 2. y is measured in dimensionless; x in dimensionless. No extra contextual interval is imposed; the original mathematical domain still applies.

My term-by-term working

Keep a row for every displayed original term, including terms that cancel. Enter each coefficient and power yourself. For a constant, choose “Constant term,” enter its derivative coefficient, and leave the new power blank. A derivative expression uses explicit * and ^, for example 6*x^2 or -3/x^4.

Original term 1: (3) · x4

If the original expression is undefined at the named input, enter the literal word “undefined” for that value. A simplified derivative formula does not repair an original hole. Use dy/dx for the notation field.

Working: Not recorded or changed

My separate derivative and interpretation

Enter your final derivative independently of your working table. Distinguish its formula from its value at the named input, and decide mathematical domain and model context separately.

Interpretation: Not recorded or changed

Task 2: differentiate the original terms

y = (-5)

Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = 0 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula.

Given input: x = 0. y is measured in dimensionless; x in dimensionless. No extra contextual interval is imposed; the original mathematical domain still applies.

My term-by-term working

Keep a row for every displayed original term, including terms that cancel. Enter each coefficient and power yourself. For a constant, choose “Constant term,” enter its derivative coefficient, and leave the new power blank. A derivative expression uses explicit * and ^, for example 6*x^2 or -3/x^4.

Original term 1: (-5)

If the original expression is undefined at the named input, enter the literal word “undefined” for that value. A simplified derivative formula does not repair an original hole. Use dy/dx for the notation field.

Working: Not recorded or changed

My separate derivative and interpretation

Enter your final derivative independently of your working table. Distinguish its formula from its value at the named input, and decide mathematical domain and model context separately.

Interpretation: Not recorded or changed

Task 3: differentiate the original terms

y = (-3) / (x2)

Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = -2 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula.

Given input: x = -2. y is measured in dimensionless; x in dimensionless. No extra contextual interval is imposed; the original mathematical domain still applies.

My term-by-term working

Keep a row for every displayed original term, including terms that cancel. Enter each coefficient and power yourself. For a constant, choose “Constant term,” enter its derivative coefficient, and leave the new power blank. A derivative expression uses explicit * and ^, for example 6*x^2 or -3/x^4.

Original term 1: (-3) / (x2)

If the original expression is undefined at the named input, enter the literal word “undefined” for that value. A simplified derivative formula does not repair an original hole. Use dy/dx for the notation field.

Working: Not recorded or changed

My separate derivative and interpretation

Enter your final derivative independently of your working table. Distinguish its formula from its value at the named input, and decide mathematical domain and model context separately.

Interpretation: Not recorded or changed

Record the current power-rule table,combined derivative,domain and substitution for every task.

What these checks cover
  • Original symbolic integer-power differentiation for 4L; no 4M stationary-point/graph or 4N motion completion is inherited.
  • The rule a*n*x^(n-1) applies to any integer n on the original domain. This finite input tool limits original powers to -12 through 12, entered powers to -24 through 24, at most 12 original terms, 64 expanded terms, 256 tokens and 2048 expression characters; these are tool bounds,not syllabus exclusions.
  • Use explicit *,/,^,balanced parentheses and the stated variable. Scalar or monomial division and finite integer powers are supported;other denominator forms need human review.
  • All actual coefficient/exponent working,combined derivative,original domain and named-input substitution are entered by the learner. Final derivative,notation,value,units,domain and context decisions are independent proposals.
  • Constants differentiate to zero and do not acquire a spurious reciprocal. Zero-power terms are treated as constants. Original negative-power holes survive cancellation,including zero-coefficient displayed negative powers.
  • Known aliases of the supplied rate unit are accepted,including degrees Celsius/minute and °C/min. Conversions to different input units are outside this finite check and need review.
  • Algebraic identity alone does not repair an original domain or a new removable hole. Incorrect complete attempts may study explanations;they are not passes,marks or mastery.
  • Written reasoning,model validity,specialist approval,formal assessment readiness and fullbook body/chapter/Hub mapping remain pending.

Written reasoning and model validity need human review. This 4L teaching/practice bundle has a structural source link; eleven other Functions source rows remain unlinked. Specialist approval and formal assessment readiness remain pending. The separate 4M gradient/stationary/extrema unit has its own structural link;the 4N motion strand remains a gap.

A derivative is a new function

For y = a*x^n with integer n, dy/dx = a*n*x^(n-1) wherever the original function is defined. The exponent multiplies the coefficient before it decreases by one. The general rule is not restricted to cubics or inverse squares. For n = 0, the original term is a constant and its derivative is zero; handle that directly rather than introducing a spurious reciprocal at zero.

Rewrite reciprocals and retain signs

Write a/x^k as a*x^(-k) before applying the rule. A negative exponent becomes one more negative after subtracting one. Both the signed original coefficient and exponent enter the multiplication. Fractional coefficients stay exact; a fractional coefficient does not make the exponent fractional.

Differentiate every original term

Apply the rule term by term to a sum or difference, then combine equal powers. Keep a working row for every displayed original term, including constants and terms that cancel. The derivative of a constant is zero; the derivative of a linear term is its coefficient. Terms do not acquire extra factors from neighbouring terms.

Substitute into the derivative and keep the original domain

The value y(a) comes from the original formula. The local gradient at x=a comes from the derivative evaluated at a, provided a lies in the original domain. Simplifying a formula does not automatically fill an original reciprocal hole. For example, 5/x - 5/x + 4 equals 4 only when x is nonzero; its derivative is zero on that original domain and does not define an original-function derivative at zero.

Notation, units and contextual meaning

Use dy/dx for differentiation with respect to x; use dC/dq or dT/dt when those are the actual variables. Do not confuse an instantaneous derivative with the average coordinate change over a finite interval. A rate has dependent-variable units divided by input units. An algebraically permitted point may still lie outside a supplied model interval. Stationary-point classification, graph reconciliation and motion applications need the separate 4M and 4N strands.

Sources for this lesson

Pause and explain

To find the local gradient at a permitted input, which expression should receive that substitution?

Put the idea to work

Worked example

y = (3)*x^(4). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = 2 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. y = (-5). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = 0 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. y = (-3)/(x^(2)). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = -2 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula.

Show the worked solution
  1. Task 1: For (3)*x^(4), coefficient times old power is (3)*(4) = 12; the new power is 4 - 1 = 3.
  2. Task 1: Combine equal powers: dy/dx = (12)*x^(3).
  3. Task 1: Retain the original domain: all real inputs are admitted by this original polynomial.
  4. Task 1: Substitute x = 2 into the derivative, giving 96 dimensionless.
  5. Task 1: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.
  6. Task 2: The constant -5 has derivative 0. Do not create a nonzero x^(-1) term or exclude zero just because n-1 would be -1.
  7. Task 2: Combine equal powers: dy/dx = 0.
  8. Task 2: Retain the original domain: all real inputs are admitted by this original polynomial.
  9. Task 2: Substitute x = 0 into the derivative, giving 0 dimensionless.
  10. Task 2: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.
  11. Task 3: Rewrite (-3)/(x^(2)) as (-3)*x^(-2), retaining the original zero exclusion.
  12. Task 3: For (-3)*x^(-2), coefficient times old power is (-3)*(-2) = 6; the new power is -2 - 1 = -3.
  13. Task 3: Combine equal powers: dy/dx = (6)*x^(-3).
  14. Task 3: Retain the original domain: zero remains excluded, including after cancellation.
  15. Task 3: Substitute x = -2 into the derivative, giving -3/4 dimensionless.
  16. Task 3: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.

Answer dy/dx = (12)*x^(3); at x=2: 96 dimensionless. Context admitted. dy/dx = 0; at x=0: 0 dimensionless. Context admitted. dy/dx = (6)*x^(-3); at x=-2: -3/4 dimensionless. Context admitted.

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From guided practice to a new situation

Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.

1 · Guided

y = (2/3)*x^(3) + (-5)*x^(1) + (7). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = -3/2 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. y = (4)/(x^(3)) + (-2)/(x^(1)) + (9). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = -2 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. y = (-1/2)*x^(5) + (3/4)*x^(2) + (-8). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = 2 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula.

Give me a hint

Rewrite reciprocals as negative powers. For each original term multiply its coefficient by the old power, then subtract one from that power. Handle constants directly, retain the original domain, and substitute into the derivative only at a permitted input.

Compare my reasoning
  1. Task 1: For (2/3)*x^(3), coefficient times old power is (2/3)*(3) = 2; the new power is 3 - 1 = 2.
  2. Task 1: For (-5)*x^(1), coefficient times old power is (-5)*(1) = -5; the new power is 1 - 1 = 0.
  3. Task 1: The constant 7 has derivative 0. Do not create a nonzero x^(-1) term or exclude zero just because n-1 would be -1.
  4. Task 1: Combine equal powers: dy/dx = (2)*x^(2) + (-5).
  5. Task 1: Retain the original domain: all real inputs are admitted by this original polynomial.
  6. Task 1: Substitute x = -3/2 into the derivative, giving -1/2 dimensionless.
  7. Task 1: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.
  8. Task 2: Rewrite (4)/(x^(3)) as (4)*x^(-3), retaining the original zero exclusion.
  9. Task 2: For (4)*x^(-3), coefficient times old power is (4)*(-3) = -12; the new power is -3 - 1 = -4.
  10. Task 2: Rewrite (-2)/(x^(1)) as (-2)*x^(-1), retaining the original zero exclusion.
  11. Task 2: For (-2)*x^(-1), coefficient times old power is (-2)*(-1) = 2; the new power is -1 - 1 = -2.
  12. Task 2: The constant 9 has derivative 0. Do not create a nonzero x^(-1) term or exclude zero just because n-1 would be -1.
  13. Task 2: Combine equal powers: dy/dx = (2)*x^(-2) + (-12)*x^(-4).
  14. Task 2: Retain the original domain: zero remains excluded, including after cancellation.
  15. Task 2: Substitute x = -2 into the derivative, giving -1/4 dimensionless.
  16. Task 2: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.
  17. Task 3: For (-1/2)*x^(5), coefficient times old power is (-1/2)*(5) = -5/2; the new power is 5 - 1 = 4.
  18. Task 3: For (3/4)*x^(2), coefficient times old power is (3/4)*(2) = 3/2; the new power is 2 - 1 = 1.
  19. Task 3: The constant -8 has derivative 0. Do not create a nonzero x^(-1) term or exclude zero just because n-1 would be -1.
  20. Task 3: Combine equal powers: dy/dx = (-5/2)*x^(4) + (3/2)*x^(1).
  21. Task 3: Retain the original domain: all real inputs are admitted by this original polynomial.
  22. Task 3: Substitute x = 2 into the derivative, giving -37 dimensionless.
  23. Task 3: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.

dy/dx = (2)*x^(2) + (-5); at x=-3/2: -1/2 dimensionless. Context admitted. dy/dx = (2)*x^(-2) + (-12)*x^(-4); at x=-2: -1/4 dimensionless. Context admitted. dy/dx = (-5/2)*x^(4) + (3/2)*x^(1); at x=2: -37 dimensionless. Context admitted.

Look for these in your work

  • Every displayed original term has my own retained coefficient/power working.
  • My signed coefficient product and lowered power agree with the correct rule.
  • My combined derivative retains the original domain without adding a new hole.
  • My final expression and evaluated value are separate from my working table.
  • My units and original-domain/model-context decisions are explicit; written reasoning still needs human review.
2 · Independent

y = (1/4)*x^(8) + (2)/(x^(5)) + (-3)*x^(1). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = 1 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. y = (5)/(x^(1)) + (-5)/(x^(1)) + (4). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = 0 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. y = (-7/3)*x^(1) + (11). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dy/dx. Separately decide whether the named input x = 0 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula.

Give me a hint

Rewrite reciprocals as negative powers. For each original term multiply its coefficient by the old power, then subtract one from that power. Handle constants directly, retain the original domain, and substitute into the derivative only at a permitted input.

Compare my reasoning
  1. Task 1: For (1/4)*x^(8), coefficient times old power is (1/4)*(8) = 2; the new power is 8 - 1 = 7.
  2. Task 1: Rewrite (2)/(x^(5)) as (2)*x^(-5), retaining the original zero exclusion.
  3. Task 1: For (2)*x^(-5), coefficient times old power is (2)*(-5) = -10; the new power is -5 - 1 = -6.
  4. Task 1: For (-3)*x^(1), coefficient times old power is (-3)*(1) = -3; the new power is 1 - 1 = 0.
  5. Task 1: Combine equal powers: dy/dx = (2)*x^(7) + (-3) + (-10)*x^(-6).
  6. Task 1: Retain the original domain: zero remains excluded, including after cancellation.
  7. Task 1: Substitute x = 1 into the derivative, giving -11 dimensionless.
  8. Task 1: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.
  9. Task 2: Rewrite (5)/(x^(1)) as (5)*x^(-1), retaining the original zero exclusion.
  10. Task 2: For (5)*x^(-1), coefficient times old power is (5)*(-1) = -5; the new power is -1 - 1 = -2.
  11. Task 2: Rewrite (-5)/(x^(1)) as (-5)*x^(-1), retaining the original zero exclusion.
  12. Task 2: For (-5)*x^(-1), coefficient times old power is (-5)*(-1) = 5; the new power is -1 - 1 = -2.
  13. Task 2: The constant 4 has derivative 0. Do not create a nonzero x^(-1) term or exclude zero just because n-1 would be -1.
  14. Task 2: Combine equal powers: dy/dx = 0.
  15. Task 2: Retain the original domain: zero remains excluded, including after cancellation.
  16. Task 2: The original expression is undefined at zero. Its simplified derivative formula does not repair that original domain hole; no original-function derivative value is claimed there.
  17. Task 2: The named input is outside the admitted original model/domain. Do not report an admitted contextual rate there.
  18. Task 3: For (-7/3)*x^(1), coefficient times old power is (-7/3)*(1) = -7/3; the new power is 1 - 1 = 0.
  19. Task 3: The constant 11 has derivative 0. Do not create a nonzero x^(-1) term or exclude zero just because n-1 would be -1.
  20. Task 3: Combine equal powers: dy/dx = (-7/3).
  21. Task 3: Retain the original domain: all real inputs are admitted by this original polynomial.
  22. Task 3: Substitute x = 0 into the derivative, giving -7/3 dimensionless.
  23. Task 3: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.

dy/dx = (2)*x^(7) + (-3) + (-10)*x^(-6); at x=1: -11 dimensionless. Context admitted. dy/dx = 0; at x=0: undefined in the original domain. Context not admitted. dy/dx = (-7/3); at x=0: -7/3 dimensionless. Context admitted.

Look for these in your work

  • Every displayed original term has my own retained coefficient/power working.
  • My signed coefficient product and lowered power agree with the correct rule.
  • My combined derivative retains the original domain without adding a new hole.
  • My final expression and evaluated value are separate from my working table.
  • My units and original-domain/model-context decisions are explicit; written reasoning still needs human review.
3 · Transfer

C = (1/4)*q^(4) + (-3)*q^(1) + (20). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dC/dq. Separately decide whether the named input q = 2 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. This invented model is admitted only on [0, 8]; its algebra does not validate a real physical or economic law. T = (-2)*t^(3) + (9)*t^(2) + (4). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dT/dt. Separately decide whether the named input t = 1 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. This invented model is admitted only on [0, 3]; its algebra does not validate a real physical or economic law. R = (3)/(x^(1)) + (-2)/(x^(2)). Rewrite any reciprocals using integer powers. For every displayed original term, record its coefficient and exponent, multiply the coefficient by the exponent, and lower the exponent by one. Explain the constant case explicitly. Combine equal powers and write dR/dx. Separately decide whether the named input x = -1 belongs to the original domain and supplied context. Give the exact derivative value there, or state undefined, with units and a reason. Do not replace differentiation with substitution in the original formula. This invented model is admitted only on [1, 4]; its algebra does not validate a real physical or economic law.

Give me a hint

Rewrite reciprocals as negative powers. For each original term multiply its coefficient by the old power, then subtract one from that power. Handle constants directly, retain the original domain, and substitute into the derivative only at a permitted input.

Compare my reasoning
  1. Task 1: For (1/4)*q^(4), coefficient times old power is (1/4)*(4) = 1; the new power is 4 - 1 = 3.
  2. Task 1: For (-3)*q^(1), coefficient times old power is (-3)*(1) = -3; the new power is 1 - 1 = 0.
  3. Task 1: The constant 20 has derivative 0. Do not create a nonzero x^(-1) term or exclude zero just because n-1 would be -1.
  4. Task 1: Combine equal powers: dC/dq = (1)*q^(3) + (-3).
  5. Task 1: Retain the original domain: all real inputs are admitted by this original polynomial.
  6. Task 1: Substitute q = 2 into the derivative, giving 5 USD/unit.
  7. Task 1: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.
  8. Task 2: For (-2)*t^(3), coefficient times old power is (-2)*(3) = -6; the new power is 3 - 1 = 2.
  9. Task 2: For (9)*t^(2), coefficient times old power is (9)*(2) = 18; the new power is 2 - 1 = 1.
  10. Task 2: The constant 4 has derivative 0. Do not create a nonzero x^(-1) term or exclude zero just because n-1 would be -1.
  11. Task 2: Combine equal powers: dT/dt = (-6)*t^(2) + (18)*t^(1).
  12. Task 2: Retain the original domain: all real inputs are admitted by this original polynomial.
  13. Task 2: Substitute t = 1 into the derivative, giving 12 degrees Celsius/minute.
  14. Task 2: The named input is inside the admitted original model/domain. Interpret the computed value only within the supplied model.
  15. Task 3: Rewrite (3)/(x^(1)) as (3)*x^(-1), retaining the original zero exclusion.
  16. Task 3: For (3)*x^(-1), coefficient times old power is (3)*(-1) = -3; the new power is -1 - 1 = -2.
  17. Task 3: Rewrite (-2)/(x^(2)) as (-2)*x^(-2), retaining the original zero exclusion.
  18. Task 3: For (-2)*x^(-2), coefficient times old power is (-2)*(-2) = 4; the new power is -2 - 1 = -3.
  19. Task 3: Combine equal powers: dR/dx = (-3)*x^(-2) + (4)*x^(-3).
  20. Task 3: Retain the original domain: zero remains excluded, including after cancellation.
  21. Task 3: Substitute x = -1 into the derivative, giving -7 score units/input unit.
  22. Task 3: The named input is outside the admitted original model/domain. Do not report an admitted contextual rate there.

dC/dq = (1)*q^(3) + (-3); at q=2: 5 USD/unit. Context admitted. dT/dt = (-6)*t^(2) + (18)*t^(1); at t=1: 12 degrees Celsius/minute. Context admitted. dR/dx = (-3)*x^(-2) + (4)*x^(-3); at x=-1: -7 score units/input unit. Context not admitted.

Look for these in your work

  • Every displayed original term has my own retained coefficient/power working.
  • My signed coefficient product and lowered power agree with the correct rule.
  • My combined derivative retains the original domain without adding a new hole.
  • My final expression and evaluated value are separate from my working table.
  • My units and original-domain/model-context decisions are explicit; written reasoning still needs human review.

Common mistakes

  • Reducing the exponent without multiplying its signed original value into the coefficient.
  • Increasing a negative power toward zero instead of subtracting one.
  • Creating a spurious x^(-1) term when differentiating a constant.
  • Substituting into the original function when the question asks for its derivative value.
  • Filling a reciprocal hole merely because the simplified derivative is constant.
  • Adding a removable hole to a derivative formula that should admit zero.
  • Reporting a mathematical rate as an admitted model rate outside the supplied interval.
Recall without your notes

What can you explain now?

If reciprocal terms cancel and the displayed original function equals a constant only for nonzero inputs, does its simplified zero derivative define an original-function derivative at zero?

Compare with the explanation

No. The original expression still excludes zero.

Differentiation and algebraic simplification do not silently enlarge the original function domain.

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Make it stick

Close the reference. Differentiate a new sum containing a positive power, a constant and a reciprocal term. Show each coefficient-times-power step, use derivative notation, and explain why simplifying the derivative cannot repair an original reciprocal hole.

If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.

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Pearson2026/2027 International GCSE entry manual Pearson Mathematics B official qualification
Course scope and assessment

Partial B-specific teaching: Number1A–K,Sets2A–I,Algebra3A–L,all14Functions source rows4A–N and Matrices5A–G have reviewed original teaching/worked/practice bundles. The27Functions lessons combine existing substantive theory and learner constructions with eight new variation-family lessons and the corrected composition counterexample. Twelve Matrices lessons supply seven further structural source links,with all six named transformation families required jointly for5F. Geometry 6F, 6G, 6H, 6I, 6J, 6K and 6L have reviewed joint teaching/practice bundles. Seven other Geometry rows and 31 rows in the four later topics remain unlinked. Those later topics remain unstarted. A structural source link does not establish exhaustive subskill,practical,specialist or formal assessment approval. No MathematicsA,Foundation or modular inheritance. Single Higher-tier linear4MB1; no Foundation or additional-Higher inheritance. These seven original Number lessons address1A–F; 1C needs both integer/root and fractional/negative-index strands. These seven lessons make no claim for later Number strands or other topics; consult their separate teaching map and actual lessons. Work exactly with original signed values and grouping; retain nonzero-denominator and real-root domains, principal even roots and signed odd roots. Surd rationalisation keeps the original denominator restriction even when a conjugate is used. Number-set membership uses the stated natural-number convention; irrationality proofs are outside1F. Model feedback is for self-checking, with human review of reasoning; no exam marks, mastery, specialist or formal-assessment approval. Both linear papers may draw on any topic. The2026/27 manual confirms standard November2026/June2027 and regional June2027 subject to centre location; the2016specification's January/June wording is historical. ISBN9780435044107 is verified metadata only; no Bbook chapter/body/Hub map or modular/onscreen route is verified. No4MA1 book or teaching credit is imported. Single Higher-tier linear4MB1. These eleven original Number1G–K lessons use exact given units, currency directions and proportional models; units and physical/count domains are explicit. Decimal-place/significant-figure answers preserve requested precision, and signed midpoint conventions and bound endpoint inclusion are stated. Source1G metric/SI and money needs all three measure/time/currency strands; 1H representations, ratios/proportion and percentages need all three strands. Bounds need both rounded-input and derived-quantity lessons, and standard form needs representation/comparison plus calculation/context lessons. This Number set does not complete any later Sets, Algebra, Functions, Matrices, Geometry, Mensuration, Vectors/transformations, Trigonometry or Statistics/probability topic. Structural links are separate from exhaustive subskill, human reasoning, mastery and formal-assessment approval. Original self-check practice only; no official marks are awarded. The2026/27 manual confirms standard November2026/June2027 and regional June2027 subject to centre location; no later examination-year availability is inferred. ISBN9780435044107 is metadata only: no verified B book-body/chapter/Hub mapping, no Mathematics A book inheritance and no B Foundation/modular/onscreen route. Single Higher-tier linear4MB1. These eight original Sets lessons cover membership and descriptions,universe-relative complement,union/intersection,inclusion,logical regions,two/three-set counts and feasibility. A source link requires its complete reviewed lesson bundle; number-set recognition1F is prerequisite context and gains no new link. Equality-allowing inclusion and proper subset are stated explicitly where the printed subset glyph is ambiguous. Missing universes,inconsistent counts and insufficient information are not replaced with invented diagrams or values. Two/three sets and the particular logical identities are chosen breadth,not a printed maximum or extra source row. Number1F’s irrationality-proof note is not a blanket waiver of Sets arguments and counterexamples. Your actual symbolic/Venn work and reasoning need human review; self-checks award no official marks or mastery/assessment approval. Standard November2026/June2027 and regional June2027 depend on the2026/27 manual and centre location; no later series is inferred. ISBN9780435044107 is B product/access metadata only; no verified B Sets chapter/body/Hub map or MathematicsA book inheritance. No Foundation,modular or onscreen B route is evidenced. Single Higher-tier linear4MB1. These eight original Algebra lessons address operations and integer/fractional indices with real domains,formula construction/substitution and subject changes,factorisation,cubic factor theorem including ax±b,cubic division and four operations with simple algebraic fractions. Each structural row needs its whole reviewed lesson bundle. Original denominator exclusions,principal square roots/branches and declared units remain part of the learner work. The finite symbolic checker accepts bounded explicit syntax,not every equivalent expression or explanation; unmatched alternative radical cancellation or general symbolic equivalence needs human review. A self-check or nonblank explanation does not award official marks or certify exhaustive subskills,reasoning,mastery,specialist or formal assessment readiness. Algebra3G–L and all later topics remain unmapped by this batch; Number and Sets links are separate. Standard November2026/June2027 and regional June2027 depend on the2026/27 manual and centre location; no later series is inferred. ISBN9780435044107 is B product/access metadata only; no verified Algebra body/chapter/Hub map or MathematicsA book inheritance. No Foundation,modular or onscreen B route is evidenced. Single Higher-tier linear4MB1. Five original equation lessons jointly link3G only when every teaching,worked,Guided,Independent and application strand remains intact: linear equations and contexts,quadratic factorisation,completing the square AND the quadratic formula,actual graphical quadratic construction,and cubic equations. Graph work requires learner-entered table values,labelled scales,actual points and curve strokes,zero-axis marks and readings. A generated ideal curve or algebra-only solution cannot substitute for that construction. Exact roots and approximate graphical readings are separate. Bounded symbolic and sampled geometry checks do not approve all equivalent methods,whole-curve smoothness,global reasoning,reading precision,mastery or official marks. Written explanations need human review; specialist and formal assessment approval remain pending. Algebra3H–L and all later topics remain unmapped by this batch; previous3A–F,Number and Sets are separate bundles. Standard November2026/June2027 and regional June2027 follow the2026/27 manual and centre location; no later entries are inferred. ISBN9780435044107 is metadata only; no verified Algebra body/chapter/Hub map or MathematicsA book inheritance. No Foundation,modular or onscreen B route is evidenced. Single Higher-tier linear4MB1. Both original3H lessons must remain complete: algebraic elimination/substitution with exact original-equation checks AND actual graphical simultaneous-equation construction on common labelled scales. Each graphical line needs the learner own calculated table,independently plotted points,two chosen retained anchors and an explicit straightedge-extension action. No generated ideal line or table substitutes for this construction. Vertical lines,parallel distinct lines,coincident lines,cropping,nonnegative context prices,exact check pairs and approximate readings remain separate. Finite rational-symbolic and geometric checks do not approve all alternative methods,written explanations,reading precision,physical instruments,mastery or official marks; specialist and formal assessment approval remain pending. Algebra3I–L and later topics remain unmapped by this batch. Entry context is2026/27 only,with regional options governed by centre location. ISBN9780435044107 is metadata only; no verified book-body/chapter/Hub map or MathematicsA inheritance. No Foundation,modular or onscreen B route is evidenced. Single Higher-tier linear4MB1. Original3I teaching includes substitution of the actual line into the quadratic,complete reduced equations,formula/factorisation or negative-discriminant reasoning,and separate partner recovery with checks in both originals. All four stages must remain available; Independent includes two distinct systems,no-real pairs and zero/fractional coordinates; Application explains one repeated contact. The finite exact rational polynomial checker requires a genuine quadratic after substitution and unrestricted real coordinates. Task-specific domains,lower-degree or line-component reductions and other methods require separate review. A supporting sketch does not replace algebra or certify graphical precision. Written reasoning,specialist and formal assessment approval remain pending; no official marks or mastery. Algebra3J–L and all later topics remain unmapped by this batch. Entry context2026/27 only. ISBN9780435044107 is metadata only; no book-body/chapter/Hub coverage or MathematicsA/Foundation/modular/onscreenB inheritance. Single Higher-tier linear4MB1,Algebra3J. Two original lessons jointly cover linear inequalities on number lines and simultaneous straight-line regions in two dimensions. Every Worked,Guided,Independent and Application construction is separate from its final answer. Negative scaling reverses order; open/closed endpoints and solid/dashed boundaries retain strictness. A finite integer list never replaces the real solution set. Closure corners may be excluded; unbounded rays continue beyond the displayed window. Empty planar claims use nonnegative-multiplier contradictions; the inclusive nonnegative-sum control is a single point. The checker uses bounded exact rational first-degree systems; the SVG is numerical display only,not approved graphical precision. No optimization or linear-programming coverage. Reasoning,specialist review and formal assessment approval remain pending; no official marks or mastery. Algebra3K–L and all later topics remain unmapped by this batch. Entry context2026/27 only. ISBN9780435044107 is metadata only; no verified book-body/chapter/Hub mapping or MathematicsA/Foundation/modular/onscreenB inheritance. Single Higher-tier linear4MB1,Algebra3K. One original lesson constructs quadratic-inequality sign charts and actual number-line unions across Worked,Guided,Independent and Application stages,with eleven separate constructions. Show the polynomial moved to zero,descending rational coefficients,discriminant,distinct exact roots,actual rational test substitutions,selected open sign intervals and zero membership. Include negative leading coefficients,repeated-root empty/singleton/punctured/all-real cases,exact irrational boundaries and no-real-root controls. Each final answer is entered separately. The bounded checker uses exact algebra for rational plus one quadratic radical; numeric SVG positions do not certify graphical precision. Nonperfect radical numerator times denominator is bounded by10^12; input rational coefficients by10^30; internal arithmetic by4096bits. Unsupported forms and unreadably close displayed points are rejected rather than rounded or merged. no official marks or mastery. Algebra3L and all later topics remain unmapped by this batch. Entry context2026/27 only. ISBN9780435044107 is metadata only; no verified book-body/chapter/Hub mapping or MathematicsA/Foundation/modular/onscreenB inheritance. Single Higher-tier linear4MB1,Algebra3L. Two original lessons cover constant differences and familiar common integer sequences through all eight Worked,Guided,Independent and Application stage definitions:thirteen actual sequence tasks and two explicit ambiguity proofs. Enter successive differences,exact signed/fractional continuations,actual powers,triangular seed sums,updated predecessor pairs and candidate-by-candidate prime certificates where relevant. Keep a separate independent final answer. A familiar finite prefix does not force a unique continuation:consistent declared alternatives are reported for discussion rather than automatically marked wrong. Named families are original examples under the source note,not an exhaustive list prescribed by Pearson. No compulsory nth-term or arithmetic-series sum is inferred. Exact rational input bounds10^30,prefixes2–16terms,continuations1–16terms,prime candidates2–10000 with at most128literal certificates,triangular seed0–64,power exponents0–24. Unsupported work is explicitly rejected. no official marks or mastery. All seven topics after Algebra remain unmapped by this batch. Entry context2026/27 only. ISBN9780435044107 is metadata only; no verified book-body/chapter/Hub mapping or MathematicsA/Foundation/modular/onscreenB inheritance. This first Functions lesson teaches finite supplied mappings through four stages and six original tasks. Draw your own arrows,record distinct images for every original input,and give a separate final classification and range. Missing and multiple images,valid many-to-one functions,unused targets and explicit domain limits are distinguished. This complete original finite-mapping record supports4B and contributes to the reviewed4A/4C/4Djoint bundles:All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. Variable evaluation,real domains/ranges,composition and inverses have separate reviewed original lessons; this finite record does not replace them. Exact rational sets are bounded to16distinct elements and64entered arrows; unsupported work is rejected. Written reasoning requires human review; specialist review and formal assessment remain pending; no official marks or mastery. Single Higher-tier linear4MB1,entry context2026/27 only. ISBN9780435044107 is metadata only; no book-body,chapter or Hub verification or MathematicsA/Foundation/modular inheritance. Original polynomial function notation and deliberate substitution, with four stages and nine actual term-table tasks. Enter the whole input, domain decision, coefficients, powers, products, sum and later output changes; record a separate final answer. A complete incorrect attempt may study the explained reference but is not accepted by fixed comparisons. Exact rational polynomials are bounded to degree three and numerical or linear-in-a inputs; original domain holes are not cancelled away. The practical finite input set is retained even when arithmetic elsewhere is possible. This is introductory4C/4Dteaching, not a complete real-domain/range,composition or inverse bundle:All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. Written reasoning needs human review. No official marks,mastery,specialist review approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27 only. ISBN9780435044107 is metadata only; no book-body,chapter or Hub verification or MathematicsA/Foundation/modular inheritance. Original selected real-domain/range teaching,with four stages,eight tasks and fourteen actual branch tables. Keep original denominator/radical conditions,stated restrictions,each branch image,attained endpoint input witnesses,units and separately entered final sets/input decisions. Seven bounded rule families and exact rational interval/point endpoints only; arbitrary expressions and irrational image endpoints are explicitly unsupported,not declared non-real. A complete incorrect attempt may study the explained reference but does not pass fixed comparisons. This is selected4Dteaching,not exhaustive Functions coverage:All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. Composition,inverses and wider Functions have separate reviewed original teaching; these bounded calculations do not establish formal approval. Written explanations need human review. No official marks,mastery,specialist approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27 only. ISBN9780435044107 is metadata only; no verified book body,chapter or Hub mapping and no MathematicsA/Foundation/modular inheritance. Continuity questions are outside the cited4Drow. Original selected composition teaching,with four stages,eight tasks and24two-step input traces. Keep the rightmost-first order,both original domains,the outer-domain preimage,actual intermediate and final images,units and separately entered final sets/input decisions. Seven bounded rule families and exact rational interval/point endpoints only; arbitrary expressions and irrational image endpoints are explicitly unsupported,not declared non-real. A complete incorrect attempt may study the explained reference but does not pass fixed comparisons. This is selected4Eteaching,not exhaustive Functions coverage:All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. General symbolic alternatives beyond this bounded self-check need human review; separate original inverse and other Functions lessons remain required. Written explanations need human review. No official marks,mastery,specialist approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27 only. ISBN9780435044107 is metadata only; no verified book body,chapter or Hub mapping and no MathematicsA/Foundation/modular inheritance. The4Estructural link requires this complete original teaching/worked/practice record and its corrected counterexample; it does not approve all symbolic alternatives. Original selected inverse teaching,with four stages,eight tasks,nine reversed branches and27 named inverse-input checks. Retain the original domain,actual image,stated target,one-to-one evidence,original holes,branch signs,return checks and swapped units. A larger target is not automatically the original image. An inverse undoes the mapping; it is not the reciprocal. Endpoint sets remain exact rational intervals. Selected simple square-root inverse values are compared exactly against the original branch and returned through the original equation; general symbolic forms and arbitrary inverse solving remain outside this bounded self-check. A squared return alone cannot choose an inverse side or change the original domain. A complete incorrect attempt may study the explained reference without passing fixed comparisons. All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map; general symbolic inverse alternatives need human review and the remaining Pearson curriculum is incomplete. Written derivations,reversed equations and whole-domain proofs need human review. No official marks,mastery,specialist approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27 only. ISBN9780435044107 is metadata only; no verified book body,chapter or Hub mapping and no MathematicsA,Foundation or modular inheritance Original selected variation teaching with four stages,eight tasks,26named prediction traces and18recovery targets. Calibrate the eight listed families from retained original observations and actual equation operations. Keep natural and stated input restrictions,all real recoveries,original-law return checks,change factors and coefficient dimensions. Exact irrational values remain defined and must be entered symbolically; selected equivalent square/cube-root values are compared exactly. More general symbolic coefficients/forms need human review. A complete incorrect attempt may study the explained reference without passing fixed comparisons. Written formulas,derivations,whole-domain arguments,unit prose and empirical model validity remain unreviewed. Finite observations do not prove a physical law. All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map; wider Functions and remaining Pearson teaching/practice are incomplete. No official marks,mastery,specialist approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27 only. ISBN9780435044107 is metadata only; no verified book body,chapter or Hub mapping and no MathematicsA,Foundation or modular inheritance. Original eight-family variation expansion: eight lessons,32 original cases and every Worked,Guided,Independent and application stage for each enumerated direct/inverse linear,square,cube and principal-root form. Together with the original general variation introduction,all nine complete same-record teaching/worked/practice bundles are required for one structural4Glink. Calibrate from original observations using actual reversible coefficient-equation operations; retain signed coefficients,the complete natural and stated domain,exact rational/simple-root predictions,all distinct admitted recoveries and their original-law returns,changed input and baseline values,ratio availability and coefficient dimensions. Both learner working and separately entered final answers begin blank; neither repairs the other. Edits,removed rows,withdrawal,reset and source/session/stage/revision changes revoke previous comparisons and references. A complete wrong attempt can study its explanation without passing. These construction cases use identified nonzero rational coefficients and nonzero rational calibration bases; origin ambiguity and zero-coefficient distinctions are taught explicitly,while more general symbolic forms need review. Software bounds are not syllabus exclusions. Written formulas,derivations,whole-domain arguments,unit prose and empirical model validity need human review. All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. The wider Pearson curriculum remains incomplete. Automated controls and initial/completed rendering are checked; fresh mounted-browser and hosted four-stage interaction remain unverified. ISBN9780435044107 is metadata only; no full book body,chapter or Hub mapping is verified. Single Higher-tier linear4MB1,entry context2026/27only; no MathematicsA,Foundation,modular or later-series inheritance. No official marks,mastery,specialist approval or formal assessment readiness. Original selected rational Cartesian coordinate teaching with four stages and twelve tasks. Read and construct ordered pairs using the original separate axis scales,signed division counts and exact multiplication. Keep fractional between-grid coordinates,all four quadrants,both axes and the origin. A plotting window is not the whole plane:an off-window point remains real and is not clamped to an edge. Supplied closed time/temperature ranges govern the hypothetical context separately. Actual construction does not fill the independent answer. A complete incorrect attempt may study the explained reference without passing fixed comparisons. Written reasoning,broader plotting judgement and practical model validity remain for human review. All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map; the4Hstructural link requires this complete original teaching,actual point construction and all four explained stages. The remaining Pearson curriculum is incomplete; broader symbolic and practical judgements still need review. No official marks,mastery,specialist approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27only. ISBN9780435044107is metadata only; no verified book body,chapter/Hub mapping or MathematicsA/Foundation/modular inheritance. Original selected rational straight-line teaching with four stages and eight tasks. Build lines from learner-chosen anchors using their original independent axis scales. Any distinct admitted rational anchors are accepted, including reversed orders and off-window points. Actual coordinate rise/run, not ratios of picture lengths, determines gradient. Retain positive, negative, fractional and zero gradients, a rearranged equation, and vertical/coincident contrasts. Actual construction never fills the separate gradient/intercept answer. Rate units and intercept units differ. Extending a mathematical line does not extend a context domain; a complete-line intercept outside the domain is not an admitted initial observation. A complete wrong attempt may study the explained reference without passing fixed comparisons. Written reasoning and model validity need human review. All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map; the4Ilink requires this complete line-construction record and4Jalso requires all three original sparse-graph strands. The remaining Pearson curriculum is incomplete; broader symbolic and practical judgements still need review. No official marks,mastery,specialist approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27only. ISBN9780435044107is metadata only; no verified book body,chapter/Hub mapping or MathematicsA/Foundation/modular inheritance. Original selected sparse numerical graph teaching with three lessons,twelve lesson/stage groups and sixteen cases. Every curve retains all six source-family coefficients,with at least three zero coefficients. Exact original-input tables and real plotted points and curve strokes precede independent interpretations. Real pointer and keyboard coordinates remain unsnapped; explicit bounded drawing-position tolerances do not soften exact table arithmetic or original zero exclusions. Both original curves remain overlaid for intersection readings; no solutions,repeated contacts,irrational readings,context filtering and cancelled reciprocal exclusions are distinguished. Complete wrong attempts may study a separate explained reference without passing fixed comparisons. Finite table,vertex and segment samples do not prove a globally correct smooth curve. Written reasoning,drawing judgement and model validity need human review. All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map; the4Jlink requires these three original graph strands plus actual affine-line construction; 4Ktangent construction has a separate original lesson. No official marks,mastery,specialist approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27only. ISBN9780435044107is metadata only; no verified book body,chapter/Hub mapping or MathematicsA/Foundation/modular inheritance. Original drawn-tangent teaching with four stages and twelve tasks. The original curve and named point are supplied givens; both tangent anchors and the third reading vertex come from actual learner input. Signed coordinate changes,calculated quotient and independent final gradient/unit/context are entered separately. Adequate alternative and reversed anchors and either right-corner orientation are supported. Pointer coordinates remain unsnapped. Original independent scales,negative/fractional gradients,cubic crossings and later meetings,reciprocal exclusions and context restrictions remain explicit. A horizontal zero-rise control is degenerate rather than a nondegenerate right triangle. A vertical line has no finite gradient. An auxiliary tangent crossing zero does not repair a reciprocal curve domain. Complete wrong attempts may study a separate explained reference without passing. Finite approximate comparisons do not approve written reasoning,tangent judgement,physical validity or formal assessment. Written reasoning,tangent judgement and practical validity require human review. This complete reviewed drawn-tangent teaching/practice bundle supplies the4Kstructural link; All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. Source mapping is separate from human drawing judgement and assessment approval. No4Ldifferentiation teaching is inferred from an internal exact reference. No official marks,mastery,specialist approval or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27only. ISBN9780435044107is metadata only; no verified book body,chapter/Hub map or MathematicsA/Foundation/modular inheritance. Original integer-power differentiation teaching with four stages and twelve tasks. Each displayed original term has actual coefficient, old-power, coefficient-times-power and lowered-power working. Constants use an explicit zero derivative without a spurious reciprocal. Reciprocals, fractional and negative coefficients, powers beyond cubics, sums, cancellation and original zero exclusions are retained. The learner enters a combined derivative and named-input substitution, then independent final expression, notation, value, rate unit, mathematical-domain and model-context decisions. Exact rational comparison accepts reordered and equivalent supported expressions without repairing original or added domain holes. The general integer-power rule is taught; the finite checker bounds are tool limits rather than syllabus exclusions. Complete wrong attempts can study an explanation without passing. The complete checked4Lteaching/practice bundle has a structural source link; All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. Source mapping is separate from specialist and formal assessment approval. No4Mstationary/turning-point or4Nmotion completion is inherited. Written reasoning, model validity and specialist review remain pending. No official marks, mastery or formal assessment readiness. Single Higher-tier linear4MB1, entry context2026/27only. BookISBN9780435044107 is metadata only; no verified full book body, chapter/Hub map or MathematicsA/Foundation/modular inheritance. Original joint4Mteaching/practice bundle across three lessons and25cases,each with Worked,Guided,Independent and Application stages. Students enter their own graph observations,term-by-term differentiation,proposed derivative,original graph markers,complete cleared root lists,domain/context decisions,sign-chart witnesses and classifications. The global comparison retains stationary values,closed endpoints,open bounds,poles,infinities,attainment and all attaining inputs. Exact rational/surd and certified interval references support bounded self-checks; the finite sparse-curve and degree-five limits are tool bounds,not syllabus exclusions. Original punctures survive simplification and both graphs; constant and stationary-without-turn cases are explicit. Correct separate answers cannot replace incorrect actual working. Complete wrong attempts may study explained references without passing. The complete source and learner-route checks support a structural4Mlink only when all three original teaching/worked/practice records remain intact. All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. The wider Pearson curriculum remains incomplete. Supplied graph stimuli do not award separate4Jcurve-drawing,4Kdrawn-tangent or4Nmotion coverage. Written reasoning,graph judgment,model validity and specialist review remain pending. No official marks,mastery or formal assessment readiness. Single Higher-tier linear4MB1,entry context2026/27only. BookISBN9780435044107 is official metadata only; no verified full book body,chapter/Hub map or MathematicsA/Foundation/modular inheritance. Original joint 4N teaching and practice across three lessons,25 cases and all twelve lesson/stage groups. Students enter term-by-term first and second derivatives,notation,units,all mathematical velocity candidates,original-domain/piece/context filtering,rest intervals and isolated/endpoint rest,reversal signs,every monotone leg,total distance,displacement and both averages. The two construction lessons require32 original graph constructions across their cases,with independently entered exact tables and axis quantities/units/scales,actual unsnapped points and stroke vertices,exact open-boundary decisions,separate branches at idealised speed jumps,and retained physical branches and ends beyond a cropped frame. Positive acceleration need not increase speed; speed cusps and mathematical two-sided versus physical one-sided gradients remain distinct. Practical rates retain their actual dependent/input units,positive magnitude,signed instantaneous value,original finite differences/averages,open physical ends and cancelled original holes. Correct independent answers cannot replace incorrect actual working. All three complete original teaching/worked/practice records are required for one structural 4N link; All14Functions source rows have reviewed structural teaching/practice links; other Mathematics B source gaps remain explicit in the current course map. The wider Pearson curriculum remains incomplete. This finite reference supports at most six continuous position pieces,eight terms per expression,powers -2 through6,complete cleared velocity degree at most five and exact rational/quadratic-field roots. These are software bounds,not syllabus exclusions; unresolved cases require review. Actual graph comparisons use finite position tolerances and65 probes per physical branch,including off-window portions; they do not prove a globally correct smooth curve. Automated calculation and drawing controls are checked; fresh browser interaction remains unverified. Original invented models and metadata-only bookISBN9780435044107 do not establish real physical/device/price validity,a full book body/chapter/Hub map,practical competence or specialist approval. No marks,mastery or formal assessment readiness. Single Higher-tier linear4MB1,exam entry context2026/27only; no MathematicsA/Foundation/modular inheritance. Original Mathematics B Matrices5A–G candidate: twelve teaching lessons,twelve worked examples,36 explained guided/independent/application practice tasks,and48 bound four-stage cases; all four specified reflection lines,rotations and enlargements have dedicated complete four-stage bundles. Matrix data,addition,multiplication,scalars,identity/zero,nonsingular2×2inverse,and plane transformations retain their own original givens. The learner enters blank working operands,intermediate results,constructions and separate final answers; edits,withdrawal,clearing,stage/reset and source/session/revision changes withhold old comparisons and explained references. Exact supported real square-root entries cover30°,45° and60° rotations in addition to quarter turns; the general cosine/sine formula is taught,while more general numerical trigonometry and equivalent forms outside the finite algebra engine require review. Written meanings,dimensions,units,geometric descriptions,drawn shapes and empirical validity need human review. All7Matrices source rows have reviewed structural teaching/practice bundles only while every original complete record remains intact. Row5Fjointly requires all six named transformation-family records,each with all four stages. Other Mathematics B source rows remain unlinked; see the current course map; the wider Pearson curriculum remains incomplete. ISBN9780435044107 is metadata only; no full book body,chapter sequence or Hub mapping is verified. Single Higher-tier linear4MB1; entry context November2026/June2027only. No MathematicsA,Foundation,modular or later-series inheritance. No fresh mounted-browser,hosted four-stage interaction,saved progress,official marks,mastery,specialist approval or formal assessment readiness is established. These two Mathematics B lessons reuse complete reviewed original StudyForA 2D and 3D Pythagoras teaching and eight stage cases. The Guided 2D case keeps both its missing-leg and exact/rounded missing-hypotenuse tasks; the 3D coordinate case still requires an originally unlocated horizontal projection endpoint. All actual triangle, hypotenuse, right-angle, section, foot and projection entries begin blank. Original numerical work, exact forms, requested precision, explicit units, equations and reasons are recorded separately from final answers. Correct answers never repair wrong geometry, and canonical figures appear separately only after a complete compared attempt. The original geometry engine and renderer are shared code; no other qualification completion or source metadata is inherited. The whole Geometry 6F source row also requires the complete acute-triangle altitude unit and all three jointly reviewed teaching and practice bundles, with actual learner routes. These two lessons alone earn no completed 6F link. Written reasoning, physical instruments and drawings, specialist approval and formal assessment remain separate. Single Higher-tier linear 4MB1; entry context November 2026/June 2027 only. No Foundation, modular or later-series inheritance. ISBN 9780435044107 is public metadata only; no verified full book body, chapter sequence or Teaching Hub mapping is claimed. Original content and local comparison controls are checked; each source link requires the complete joint bundle in the course map. Fresh mounted-browser events and saved account-progress isolation are unverified. This original acute-triangle lesson fills the specific 4MB1 Geometry 6F altitude subskill. It retains one worked example, guided practice, two separately required Independent examples and an application task across five bound cases. The source row also requires the complete 2D and 3D Pythagoras programme; this lesson alone earns no completed 6F link. Students construct an actual foot D, explain the perpendicular, retain both right-triangle calculations and record separate final answers. Incorrect geometry is not repaired by correct numbers or by studying a reference. Exact fractions and a positive irrational-height example are included; illustrative drawings are not measurement scales. Written equations, theorem reasons, assumptions, physical drawing/instrument accuracy and contextual decisions need human review. No marks, mastery, specialist approval or formal assessment readiness is established. Single Higher-tier linear 4MB1; entry context November 2026/June 2027 only. No Mathematics A, Foundation, modular or later-series inheritance. ISBN 9780435044107 is public metadata only; no full book body, chapter sequence or Teaching Hub content is verified. This original content and local comparison activity is part of the joint course bundle; a title or tag alone does not earn a source link. Fresh mounted-browser events and persisted account progress remain unverified. Nine Mathematics B circle lessons reuse reviewed original StudyForA teaching and geometry cases, with B-specific source, outcome and learner bindings. Geometry 6K jointly requires vocabulary, centre/chord bisection and converse, equal tangents and contact radii, centre/circumference angles including the reflex choice, diameter and same/opposite segment angles, the alternate-segment theorem with the selected tangent ray, and internal/external intersecting-chord products with positive ordered lengths and rejected algebraic roots. Geometry 6L requires the complete cyclic-quadrilateral lesson, including membership, opposite pairs, exterior-angle reasoning and the off-circle counterexample. Each lesson retains original teaching, an explained worked example and Guided, Independent and application practice. The interactive geometry begins with blank selections and responses; complete attempts can be compared and studied even when wrong. Written reasons, theorem use, application decisions, instrument competence and drawings still need human review. These links do not establish expert approval, marks, mastery or formal assessment readiness. Scope is single Higher-tier linear 4MB1, with November 2026/June 2027 entry context only. No Mathematics A, Foundation, modular, later-series or full-book completion is inherited. ISBN 9780435044107 is public metadata only: book bodies, chapter sequence and Teaching Hub material remain unverified. The other eleven Geometry rows and the wider Pearson curriculum remain separate gaps. Original content and local comparison controls are checked; source links require the complete bundles in the course map. Fresh mounted-browser events and saved-progress isolation are unverified.

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