Mathematics 9709 · AS & A Level · Complex numbers

Complex numbers — practice question

The complex numbers $u$ and $w$ satisfy $u - w = 2i$ and $uw = 6$.
(a)[5]

Determine $u$ and $w$, with each answer written in the form $x + iy$, where $x$ and $y$ are exact real values.

(b)[5]

On a sketch of an Argand diagram, shade the set of points for complex numbers $z$ that satisfy $|z - 2 - 2i| \leq 2$, $0 \leq \arg z \leq \frac{1}{4}\pi$ and $\operatorname{Re} z \leq 3$.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: Remove $u$ or $w$ to reach an equation in $w$ or $u$

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