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Nov 2020 p31 q2
1945
On a sketch of an Argand diagram, shade the region whose points represent complex numbers \(z\) satisfying the inequalities \(|z| \geq 2\) and \(|z - 1 + i| \leq 1\).
Solution
1. The inequality \(|z| \geq 2\) represents the region outside a circle centered at the origin with radius 2.
2. The inequality \(|z - 1 + i| \leq 1\) represents the region inside a circle centered at \(1 - i\) with radius 1.
3. On the Argand diagram, plot the circle centered at the origin with radius 2.
4. Plot the circle centered at \(1 - i\) with radius 1.
5. Shade the region that is outside the first circle and inside the second circle.