#### Answer

$8i$

#### Work Step by Step

Step 1: $\sqrt (-64)$
Step 2: $\sqrt (-1\times64)$
Step 3: $\sqrt -1 \times \sqrt 64$
Step 4: Since $\sqrt -1=i$ and $\sqrt 64=8$, the expression becomes $i\times8$
Step 5: Simplifying, the final answer is $8i$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$8i$

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