Answer
$2-8i$
Work Step by Step
$\sqrt 4-\sqrt {-64}$
=$2-\sqrt {-1\times64}$
=$2-(\sqrt {-1}\times\sqrt {64})$
=$2-(i\times\sqrt {64})$
=$2-(i\times8)$
=$2-8i$
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: 16
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