Answer
$10+10i$
Work Step by Step
Use complex aritmetic rule
$(a+bi)(c+di)=(ac-bd)+(ad+bc)i$
a=2
b=4
c=3
d=-1
$=(2· 3−4(−1))+(2(−1)+4· 3)i$
Doing work within the parenthesis leaves us with
$10+10i$
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