Precalculus (6th Edition)

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



Work Step by Step

$4i\left( 2+5i\right) \left( 2-i\right) =4i\left( 4-2i+10i-5i^{2}\right) =4i\left( 4+8i-5\times \left( -1\right) \right) =4i\left( 9+8i\right) =36i+32i^{2}=36i+32\times \left( -1\right) =36i-32$
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