Answer
$ 21 -20i$
Work Step by Step
$(5-2i)^2$
$= 25 - 10i - 10i+ 4i^2$
$= 25-20i+ 4\times (-1)$
$= 25 - 4 -20i$
$= 21 -20i$
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: 20
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