Answer
$15$
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 $i^{2}=-1$,
$-15\times i^{2}=-15\times-1=15$.
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 - Practice - Page 736: 11
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