Answer
$ 21 - 15i$
Work Step by Step
$-3i \times 7i - 3i \times (-5) $
$ = -21 i^2 - 15i$
$ = -21 \times (-1) -15i$
$ = 21 - 15i$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 2 - Section 2.1 - Complex Numbers - Exercise Set - Page 314: 9
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