2025 WGS P2 Q7

2025 WGS P2 Q7

Secondary 4
7 marks
  1. Factorise \(8x^3+125\).[1]
  2. Hence,
    1. Express 1125 as a product of two integers,[2]
    2. Solve \(8x^3+125=39(2x+5)\).[4]

Solution:

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Answer:(a) \((2x+5)(4x^2-10x+25)\). (b)(i) \(1125=15\times75\). (ii) \(x=-\dfrac52,\ -1,\ \dfrac72\).

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