2024 TMJC P1 Q7

2024 TMJC P1 Q7

8 marks
Prelims

A curve \(C\) has equation \({{y}^{2}}=3{{x}^{3}}-x+1\).

  1. Find the exact coordinates of all the stationary points.[4]
  2. A particle moves along \(C\) to the stationary point \(S\), found in part (i) where both the \(x\)-coordinate and \(y\)-coordinate are positive. Given that its \(x\)-coordinate is increasing at a rate of \(\frac{1}{9}\) units per second, find the exact rate of change of the gradient of \(C\) when the particle is at point \(S\).[4]

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Answer:(i) \(\left(\dfrac13,\dfrac{\sqrt7}{3}\right)\), \(\left(\dfrac13,-\dfrac{\sqrt7}{3}\right)\), \(\left(-\dfrac13,\dfrac{\sqrt{11}}3\right)\), \(\left(-\dfrac13,-\dfrac{\sqrt{11}}3\right)\) (ii) \(\dfrac{\mathrm dm}{\mathrm dt}=\dfrac1{\sqrt7}\text{ units s}^{-1}\)

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