Answer
$15+9i$
Work Step by Step
$3(5+\sqrt {-9})$
=$15+3\sqrt {-1\times9}$
=$15+3(\sqrt {-1}\times\sqrt 9)$
=$15+3(i\times3)$
=$15+3(3i)$
=$15+9i$
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: 20
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