Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 10 - Section 10.7 - Complex Numbers - Exercise Set - Page 740: 33

Answer

$63$

Work Step by Step

$-9i \cdot 7i = -63i^2 = -63(-1) = 63$
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