2025 CGS PRELIMS P1 Q4

2025 CGS PRELIMS P1 Q4

Secondary 4
4 marks
2025 Crescent Girls' School Prelims A Math Paper 1
  1. Express \(-4x^2+12x+2\) in the form \(a(x+b)^2+c\) and state the coordinates of the turning point of the curve \(y=-4x^2+12x+2\).[3]
  2. Hence explain why the turning point is a maximum point.[1]

Solution:

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Answer:(a) \(y=-4\left(x-\frac{3}{2}\right)^2+11\), turning point \(\left(\frac{3}{2},11\right)\). (b) \(a=-4<0\), so it is a maximum point.

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