Answer
$−5$
Work Step by Step
Step 1: $\sqrt −25×\sqrt -1$
Step 2: As $\sqrt -1=i$, the expression becomes $i\sqrt 25\times i$
Step 3: Since $i^{2}=-1$, the expression becomes $−\sqrt 25$
Step 4: Simplifying, the expression becomes $−5$
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 734: 5
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