Answer
$\color{blue}{-32+36i}$
Work Step by Step
$4i(2+5i)(2-i)$
$4i(4-2i+10i-5i^2)$
$4i(4+8i-5(-1))$
$4i(4+8i+5)$
$4i(8i+9)$
$32i^2+36i$
$32(-1)+36i$
$\color{blue}{-32+36i}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 1 - Equations and Inequalities - Chapter 1 Test Prep - Review Exercises - Page 178: 28
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