Given $w = 1 + 2i$ and $u = 3 - i$ , express $uw$ in the form $a + ib$ .

5 - 5i

5 + 5i

3 - 2i

1 + 5i

Explanation

(3-i)(1+2i)=3+6i-i-2i^2=3+5i+2=5+5i

Derived from ZIMSEC Mathematics Paper 1, November 2017, Q1

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