Answer
$50$
Work Step by Step
Use: $i^2=-1$
$(1+7i)(1-7i)=1^2-(7i)^2=1-49i^2=1-49(-1)=50$
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: 69
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