Mathematics 9709 · AS & A Level · Differentiation

Differentiation — practice question

The variables $u$, $x$ and $y$ satisfy $u = 2x(y - x)$ together with $x + 3y = 12$.

(main)[5]

Write $u$ in terms of $x$ and so determine the stationary value of $u$.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Writes $u$ accurately in terms of $x$.” …