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: 66

Answer

$18$

Work Step by Step

$(\sqrt 2 + 4i)(\sqrt 2 - 4i) = 2 +4i\sqrt 2 - 4i\sqrt 2 - 16i^2 = 2 -16 (-1) = 18$
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