2026 NASS P1 Q4

2026 NASS P1 Q4

Secondary 4
7 marks
  1. Find the coefficient of \(x^3\) in the binomial expansion of \(\left(\dfrac1x-\dfrac{x^2}2\right)^{12}\).[3]
  2. The coefficients of \(x\) and \(x^2\) in the binomial expansion of \((3+2x)^n\) are equal. Find the value of \(n\).[4]

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Answer:(a) \(-\dfrac{99}4\). (b) \(n=4\).

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