Answer
$58$
Work Step by Step
$(3-7i)(3+7i)$
=$3(3+7i)-7i(3+7i)$
=$9+21i-21i-49i^{2}$
=$9+21i-21i-49(-1)$
=$9-49(-1)$
=$9+49$
=$58$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 8 - Radical Functions - 8.5 Complex Numbers - 8.5 Exercises - Page 663: 51
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