Mathematics 9709 · AS & A Level · Differentiation

Differentiation — practice question

The curve obeys $\frac{d^2y}{dx^2} = \frac{24}{x^3} - 4$. It has a stationary point at $P$ for which $x = 2$.
(i)[1]

State, with justification, the nature of this stationary point.

(ii)[4]

Find a formula for $\frac{dy}{dx}$.

(iii)[4]

Given that the curve passes through the point $(1,13)$, determine the coordinates of the stationary point $P$.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: Because $\frac{d^2y}{dx^2}$ is negative at $x=2$, identify maximum

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