Answer
40
Work Step by Step
Step 1: $(6-2i)(6+2i)$
Step 2: $6(6+2i)-2i(6+2i)$
Step 3: $36+12i-12i-4i^{2}$
Step 4: $36-4i^{2}$
Step 5: Since $i^{2}=-1$, the expression becomes $36-4(-1)$ which is equal to 40
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Test - Page 751: 28
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