2023 YTSS P2 Q6

2023 YTSS P2 Q6

Secondary 4
8 marks

A curve has the equation \(y=x^3-2x+5\). The normal to the curve at \(x=1\) meets the \(y\)-axis at \(A\) and the \(x\)-axis at \(B\).

  1. Find the area of triangle \(AOB\), where \(O\) is the origin.[6]
  2. The tangent to the curve at \(x=1\) is parallel to the tangent at point \(Q\). Find the coordinates of \(Q\).[2]

Solution:

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Answer:(a) \(12.5\text{ units}^2\). (b) \(Q=(-1,6)\).

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