Answer
$60.75-54i$
Work Step by Step
$(7.5+3i)(4.5-9i)$
=$7.5(4.5-9i)+3i(4.5-9i)$
=$7.5(4.5)-7.5(9i)+3i(4.5)-27i^{2}$
=$33.75-67.5i+13.5i-27(-1)$
=$33.75+27-67.5i+13.5i$
=$60.75-54i$
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: 47
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