Answer
$20$
Work Step by Step
Using $i^2=-1$, the expression $
(6-2i)(3+i)
$ simplifies to
\begin{array}{l}
6(3)+6(i)-2i(3)-2i(i)
\text{(use the FOIL method)}
\\=
18+6i-6i-2i^2
\\=
18-2(-1)
\\=
20
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 463: 59
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