Easy -1.8 This is a 1-mark multiple choice question testing basic recall of complex number properties: zz* = |z|² = 3² + (-1)² = 10. Requires only direct application of a standard formula with no problem-solving, making it significantly easier than average A-level questions.
$z = 3 - i$
Determine the value of $zz*$
Circle your answer.
[1 mark]
$10$ $\qquad$ $\sqrt{10}$ $\qquad$ $10 - 2i$ $\qquad$ $10 + 2i$
\hfill \mbox{\textit{AQA Further AS Paper 1 2018 Q1 [1]}}