Answer
$40$
Work Step by Step
Step 1: $(2+6i)(2-6i)$
Step 2: $2(2-6i)+6i(2-6i)$
Step 3: $4-12i+12i-36i^{2}$
Step 4: $4-36i^{2}$
Step 5; As $i^{2}=-1$,
$4-36i^{2}=4+36=40$
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 1-8 - Cumulative Review - Page 681: 100
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