Answer
$2$
Work Step by Step
$(1 - i)(1 + i) = 1 - i + i - i^2 = 1 - (-1) = 2$
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 - Section 10.7 - Complex Numbers - Exercise Set - Page 740: 49
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