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: 27



Work Step by Step

$-5i\left( 3-i\right) ^{2}=-5i\left( 9-2\times 3\times i+i^{2}\right) =-5i\left( 9+3i+\left( -1\right) \right) =-5i\left( 8+3i\right) =-40i-15i^{2}=-40i-15\times \left( -1\right) =15-40i$
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