$-6 + 10i$
Work Step by Step
RECALL: (1) $a(b+c) = ac + bc$ (2) $i^2=-1$ Use rule (1) above to obtain: $=2i(5) + 2i(3i) \\=10i + 6i^2$ Use rule (2) above to obtain: $=10i + 6(-1) \\=10i +(-6) \\=-6 + 10i$
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