Answer
$12 + 9i$
Work Step by Step
$3i(2 - i)^2= 3i(4 -2i - 2i + i^2) = 3i(4 - 4i + (-1)) $
$= 3i(3 - 4i) = 9i - 12i^2 = 3i - 12(-1) = 12 + 9i$
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 - 1.3 Complex Numbers - 1.3 Exercises - Page 112: 69
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