2025 WGS P1 Q4

2025 WGS P1 Q4

Secondary 4
4 marks
  1. It is given that \(y=\dfrac{4x-1}{2x+5}\) for \(x\ne-\dfrac52\), find \(\dfrac{\mathrm{d}y}{\mathrm{d}x}\).[3]
  2. Explain why \(y\) is an increasing function.[1]

Solution:

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Answer:(a) \(\dfrac{22}{(2x+5)^2}\). (b) The derivative is positive on each domain interval.

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