Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 1 - Equations and Inequalities - 1.3 Complex Numbers - 1.3 Exercises - Page 112: 70

Answer

$120 -35i$

Work Step by Step

$-5i(4 - 3i)^2= -5i(16 -12i - 12i + 9i^2) = -5i(16 - 24i + 9(-1)) $ $=-5i(7 - 24i) = -35i + 120i^2 = -35i +120(-1) =- 120 -35i$
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