Mathematics 9709 · AS & A Level · Complex numbers

Complex numbers — practice question

The complex number $w$ is given by $w = 2 + i$.
(i)[3]

With your working shown, write $w^2$ as $x + iy$, where $x$ and $y$ are real numbers, and determine the modulus of $w^2$.

(ii)[3]

On an Argand diagram, shade the set of points for the complex numbers $z$ that satisfy $|z - w^2| \leq |w^2|$.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: Carry out the multiplication and apply $i^2=-1$.

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