Answer
12+84i
Work Step by Step
(8-4i)(-3+9i)
-24+72i+12i-36$i^{2}$ Double Distribution (FOIL)
-24+84i-36(-1) Combine like terms and use the property $i^{2}$=-1
-24+84i+36 Simplify
12+84i Simplify
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