Work Step by Step
$-5i(4 - 3i)^2= -5i(16 -12i - 12i + 9i^2) = -5i(16 - 24i + 9(-1)) $ $=-5i(7 - 24i) = -35i + 120i^2 = -35i +120(-1) =- 120 -35i$
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