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 - Practice - Page 736: 11



Work Step by Step

Step 1: $-5i\times3i$ Step 2: $(-5\times3)\times(i\times i)$ Step 3: $-15\times i^{2}$ Step 4: Since $i^{2}=-1$, $-15\times i^{2}=-15\times-1=15$.
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