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A Level · Cambridge (CIE) · 9709

Differentiate rational powers, sums and differences

Rewrite roots and reciprocals as powers, apply the power rule term by term and check where the real function has a finite derivative.

Pure Mathematics 1 · Differentiation · 1.7

Pure Mathematics 1 (Paper 1) · AS & A Level Mathematics 9709, 2026–2027. Use an informal understanding of limits; formal general differentiation from first principles and points of inflexion are not required in section 1.7. Written practice is self-checked.

Before you begin

  • Use exponent laws for roots and reciprocals.
  • Understand first- and second-derivative notation.

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

Quick readiness check

Which power equals 1/x² for x ≠ 0?

What you will learn

  • Differentiate constant multiples, sums and differences of xⁿ for rational n.
  • Find first and second derivatives while respecting roots, reciprocals and exceptional inputs.

Multiply by the exponent, then subtract one

For a rational exponent n at inputs where the real function is differentiable, d(xⁿ)/dx = nx^(n − 1). Multiply a constant coefficient by n and decrease the power by 1. A constant term has derivative zero. Differentiate sums and differences term by term: the sign belongs to its coefficient and must remain in the calculation.

For x > 0, y = 3x³ − 4√x + 5/x + 7 becomes 3x³ − 4x^(1/2) + 5x^(−1) + 7. Its first derivative is 9x² − 2x^(−1/2) − 5x^(−2), or 9x² − 2/√x − 5/x². Differentiating again gives 18x + x^(−3/2) + 10x^(−3). Keep negative exponents separate from negative coefficients.

Check the original domain and any derivative exclusions

A reciprocal requires a non-zero denominator, and an even root needs a non-negative radicand for a real value. The derivative of √x is 1/(2√x) for x > 0; its endpoint x = 0 does not have a finite derivative. Do not extend a formula to an input where its original function is undefined or where its derivative expression has a zero denominator.

Odd roots can be real at negative inputs. For y = x^(1/3), interpret x^(1/3) as the real cube root; y′ = 1/[3x^(2/3)] at x ≠ 0. At x = −8, x^(2/3) = (∛(−8))² = 4, so the gradient is 1/12. At zero, nearby chord gradients h^(1/3)/h = 1/|h|^(2/3) grow without bound, so no finite derivative exists there. Check the particular real function rather than excluding every negative input automatically.

Pause and explain

What is the derivative of −4√x for x > 0?

Put the idea to work

Worked example

For x > 0, find the first and second derivatives of y = 3x³ − 4√x + 5/x + 7.

Show the worked solution
  1. Rewrite the variable terms as 3x³ − 4x^(1/2) + 5x^(−1).
  2. Apply the power rule to obtain y′ = 9x² − 2x^(−1/2) − 5x^(−2).
  3. Apply it again: y″ = 18x + x^(−3/2) + 10x^(−3); the supplied positive domain makes these real and finite.

Answer y′ = 9x² − 2/√x − 5/x²; y″ = 18x + 1/x^(3/2) + 10/x³, for x > 0.

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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

For y = 2x⁴ − 3x² + 6x − 9, find y′, y″ and y′ at x = 2.

Give me a hint

Differentiate each term independently, then evaluate the first-derivative rule.

Compare my reasoning
  1. The first derivative is y′ = 8x³ − 6x + 6; the constant −9 contributes zero.
  2. The second derivative is y″ = 24x² − 6.
  3. At x = 2, y′ = 64 − 12 + 6 = 58.

y′ = 8x³ − 6x + 6; y″ = 24x² − 6; y′(2) = 58.

Look for these in your work

  • Apply the coefficient and exponent changes to every term.
  • Distinguish differentiating from evaluating a rule.
2 · Independent

For x > 0, y = 4√x − 6/x + 3. Find y′, y″ and their values at x = 4 exactly.

Give me a hint

Rewrite the root and reciprocal as rational powers before differentiating twice.

Compare my reasoning
  1. y = 4x^(1/2) − 6x^(−1) + 3 gives y′ = 2/√x + 6/x².
  2. Differentiate again to obtain y″ = −1/x^(3/2) − 12/x³.
  3. At x = 4, y′ = 1 + 3/8 = 11/8 and y″ = −1/8 − 3/16 = −5/16.

y′ = 2/√x + 6/x²; y″ = −1/x^(3/2) − 12/x³; y′(4) = 11/8; y″(4) = −5/16.

Look for these in your work

  • Track the reciprocal coefficient's sign through both differentiations.
  • Use exact root and power values at the permitted input.
3 · Transfer

For the real cube-root curve y = x^(1/3), find its gradient at x = −8 and explain what happens to the derivative at x = 0.

Give me a hint

Interpret the odd root as a real cube root, then check the exceptional zero input separately.

Compare my reasoning
  1. For x ≠ 0, y′ = 1/[3x^(2/3)].
  2. At x = −8, x^(2/3) = (−2)² = 4, so y′ = 1/12.
  3. At zero, chord gradients 1/|h|^(2/3) become unbounded as h tends to zero, so there is no finite derivative there.

Gradient 1/12 at x = −8; no finite derivative at x = 0.

Look for these in your work

  • Evaluate the rational power using the real odd root.
  • Check the exceptional input instead of substituting into an undefined derivative formula.

Common mistakes

  • A negative exponent is not a negative coefficient.
  • Differentiate a constant to zero rather than keeping it in the gradient.
  • Check real domains and finite derivatives at root or reciprocal boundaries.
Recall without your notes

What can you explain now?

Find the derivative of 6/x² for x ≠ 0.

Compare with the explanation

−12/x³.

Write 6x^(−2), multiply its coefficient by −2 and decrease the exponent to −3.

After trying it yourself, choose your next review. This is your self-assessment.

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Make it stick

Rewrite a root and a reciprocal as powers, differentiate twice and explain how you decide which real inputs permit each rule.

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.

Keep learning Mathematics

Course scope and assessment

312 sequenced lessons provide 936 guided, independent and application problems covering the 160 objectives in sections 1.1–1.8, 2.1–2.6, 3.1–3.9, 4.1–4.5, 5.1–5.5 and 6.1–6.5. The map lists all 38 sections across six alternative components; all eight Pure Mathematics 1 sections and all six Pure Mathematics 2 sections, from Paper 2 Algebra through Numerical solution of equations, currently have full teaching sequences. Paper 3 Algebra, section 3.1, links the six shared foundation lessons plus six lessons on partial fractions and rational binomial expansions; Paper 3 logarithms, trigonometry and numerical equations use the shared lessons, with the Paper 1 graph foundation linked into trigonometry. Paper 3 differentiation combines the shared methods with its inverse-tangent derivative lesson. Paper 3 Integration links four shared standard and identity lessons plus seven advanced lessons, covering all six section 3.5 requirements. Eight Vectors lessons cover all six section 3.7 requirements, with 2D and 3D line and solid applications. Nine Differential equations lessons cover all four section 3.8 requirements, including Paper 3 integration techniques, initial conditions, equilibrium solutions and conditional model interpretations. Eleven Complex numbers lessons cover all eight section 3.9 requirements, with seven Argand diagrams and explicit argument and boundary checks. All nine Pure Mathematics 3 sections now have teaching linked to every mapped requirement. Nine Forces and equilibrium lessons cover all seven section 4.1 requirements, with six force diagrams, signed incline-friction intervals, reaction-dependent pull and push limits and separate-body third-law checks. Nine Kinematics lessons cover the four official section 4.2 requirements, with the graph requirement mapped to three relationships. Six motion diagrams support directed quantities, graph slopes and signed areas, Paper 1 time-calculus methods, reversal distances, constant-acceleration stages and shared-clock particle meetings. Six Momentum lessons cover both section 4.3 requirements, including signed system totals, conservation assumptions, outgoing velocities, coalescence, unknown masses and successive impacts. Four diagrams show system momentum through the stipulated events, and supplied kinetic-energy checks distinguish conservation of momentum from changes in kinetic energy. Twelve Newton’s laws lessons cover all four section 4.4 requirements, with vertical support and release stages, rough horizontal and incline motion, inferred parameters, hanging and surface pulley systems, rigid tow-bar thrust and slack-string transitions. Seven force diagrams support the separate-particle balances. Nine Energy, work and power lessons cover all five section 4.5 requirements, with angle-dependent work, kinetic and reference potential energy, signed net-work balances, smooth curved slides, rough and driven slopes, ideal connected-system energy and instantaneous power on hills. Five diagrams distinguish the energy inputs, losses and valid positive-speed force model. All five Mechanics sections now have teaching and staged practice linked to their mapped requirements. Thirteen Representation of data lessons cover all five section 5.1 requirements, including choice and limitations of displays, ordered and back-to-back stems, raw summaries and box plots, unequal-width density histograms, cumulative-frequency interpolation, descriptive moment calculations, grouped estimates, coding, combining two datasets and correcting totals. Six accessible diagrams retain repeated observations and distinguish numerical spread, frequency area and estimated readings. Ten Permutations and combinations lessons cover both official section 5.2 requirements, with selection and ordered roles, repeated objects, adjacency blocks, non-adjacency gaps, leading-zero cases, labelled multi-row seating and mixed restrictions. Six accessible diagrams show outcome trees, ordered versus unordered choices, repeated copies, blocks, gaps and distinct row seats. Eleven Probability lessons cover all four section 5.3 requirements, with equiprobable elementary outcomes, selection-based probabilities, complements and disjoint regions, independence tests, restricted sample spaces, two-way tables, replacement and removal trees, reversed conditions and unknown parameters. Seven accessible diagrams show dice outcomes, random subsets, event regions, a conditioned grid, a count table and two probability trees. Twelve Discrete random variables lessons cover all three official section 5.4 requirements, with complete probability tables, moment and parameter checks, binomial assumptions, exact probabilities and moments, geometric first-success probabilities, tails, expectation and integer reliability thresholds. Six accessible diagrams distinguish outcome grouping, weighted moments, fixed trials, discrete probability bars, waiting conventions and integer tail deadlines. Twelve Normal distribution lessons cover all three official section 5.5 requirements, with continuous-area interpretation, MF19 cumulative tables, full standardisation, tail and interval regions, conditional probabilities, percentiles, one- and two-parameter inference, binomial suitability, continuity corrections and approximate integer thresholds. Seven accessible diagrams show model areas, table reading, aligned scales, intervals, quantiles, matched binomial and normal shapes and whole integer cells. All five Statistics 1 sections now have teaching and staged practice linked to their mapped requirements. Fourteen Poisson distribution lessons cover all five official section 6.1 requirements, with homogeneous event-count assumptions, exposure scaling, exact masses and tails, conditional count events, moments, parameter inference, probability duration targets, disjoint and overlapping windows, rare-count binomial approximations, matched normal approximations and continuity corrections. Nine accessible diagrams show event exposures, unit conversions, discrete bars, complete tail complements, population moments, shared windows, approximate count models and integer cells. Exact checks distinguish approximate and exact close-target decisions. Fourteen Linear combinations lessons cover the six listed results in official section 6.2, with affine moments, signed scales and constant cases, expectation without independence, independent squared variance contributions, fixed and random fees, independent copies versus reused values, affine normal events, independent normal sums and differences, weighted and conditional areas, coefficient inference, exact independent Poisson sums and overlapping exposure limits. Nine accessible diagrams distinguish scale changes, variance contributions, component costs, copy mechanisms, aligned normal scales, summed areas, Poisson count pairs and unsupported distribution claims. Fourteen Continuous random variables lessons cover both official section 6.3 requirements, with density validity and units, support-aware intervals, complements and conditional regions, first and second moments, percentiles by direct density areas, symmetry checks, parameter inference, infinite-support power and exponential integrals, divergent-moment limits and combined applications. Nine accessible diagrams distinguish density height from probability, normalisation, negative-density failures, central and conditional areas, mean versus median, percentile locations and partial infinite tails. Explicit cumulative distribution function knowledge is not required. Eighteen Sampling and estimation lessons cover all eight official section 6.4 requirements, with population and frame definitions, random-number selection, sampling-quality limits, independent sample-mean moments, normal means, CLT conditions, SE scaling, raw, summarised and coded unbiased estimates, known-variance and large-sample mean intervals, repeated-sampling interpretation, precision planning, proportion intervals, sparse-outcome limits and contextual applications. Ten accessible diagrams distinguish selection frames, number rejection, repeated sample means, population versus mean density, CLT models, variance divisors, interval targets, illustrative coverage, integer size checks and proportion margins. Eighteen Hypothesis tests lessons cover all five official section 6.5 requirements, with pre-specified alternatives, inclusive count tails, explicit equal-tail conventions, integer critical regions and actual significance, exposure-aware Poisson tests, continuity-corrected count approximations, normal and large-sample mean tests, confidence-interval connections, error classifications, fixed-region binomial, Poisson and normal error probabilities and sample-size power comparisons. Nine accessible diagrams show the testing procedure, exact count regions, unequal Poisson tails, discrete significance jumps, corrected count boundaries, matching mean intervals and alternative error distributions. All shared lessons are counted once in the course total. All 38 sections now link teaching and practice. Eight earlier overview lessons remain available, but do not count as full section coverage. This is a content-availability measure, not full programme completion or exam readiness. Written practice is self-checked, not officially marked. Check the 2028–2030 syllabus separately if sitting an examination from 2028; this teaching map uses 2026–2027 requirements.

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