Intermediate Algebra: Connecting Concepts through Application

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: 20

Answer

$15+9i$

Work Step by Step

$3(5+\sqrt {-9})$ =$15+3\sqrt {-1\times9}$ =$15+3(\sqrt {-1}\times\sqrt 9)$ =$15+3(i\times3)$ =$15+3(3i)$ =$15+9i$
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