Answer
$-56-90i$
Work Step by Step
Use: $i^2=-1$
$(5-9i)^2=5^2-2(5)(9i)+(9i)^2=25-90i+81i^2=25-90i+81(-1)=-56-90i$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - Review Exercises - Page 153: 70
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