Mathematics 9709 · AS & A Level · Integration

Integration — practice question

Consider a curve for which $\frac{dy}{dx} = \frac{12}{\sqrt{4x + a}}$, where $a$ is constant. Point $P(2, 14)$ lies on the curve, and the normal at $P$ has equation $3y + x = 5$.
(i)[3]

Show that $a = 8$

(ii)[4]

Find the equation of the curve

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: Normal gradient correctly given as $m=-\frac13$

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