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: 47

Answer

$12-i$

Work Step by Step

Combine like terms to obtain: $=(3+9)+(2i-3i) \\=12+(-i) \\=12-i$
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