Answer
$8i$
Work Step by Step
Step 1: $\sqrt {-64}$
Step 2: $\sqrt {-1}\times\sqrt {64}$
Step 3: As $\sqrt {-1}=i$, the expression becomes $i\times\sqrt {64}$.
Step 4: $i\times\sqrt {64}=i\times8=8i$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 8 - Radical Functions - 8.5 Complex Numbers - 8.5 Exercises - Page 663: 1
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