2025 BVSS PRELIMS P2 Q7

2025 BVSS PRELIMS P2 Q7

Secondary 4
8 marks
2025 Bedok View Secondary School Prelims A Math Paper 2
  1. Find the coefficient of \(x^3\) in the expansion of \((7+2x)\left(1-\frac{x}{5}\right)^8\).[4]
  2. In the expansion of \(\left(3+\frac{x}{2}\right)^n\), the coefficient of \(x^2\) is three times the coefficient of \(x^3\). Find \(n\).[4]

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Answer:(a) \(-\frac{112}{125}\) (b) \(n=8\)

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