Answer
$128i$
Work Step by Step
$(-2i)^7 = (-2)^7 \cdot i^7 = -128 \cdot i^4 \cdot i^3 = -128 \cdot 1 \cdot -i = 128i$
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: 82
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