Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 8 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.1 Complex Numbers - 8.1 Exercises - Page 358: 74

Answer

$18$

Work Step by Step

Step 1: $(\sqrt 2-4i)(\sqrt 2+4i)$ Step 2: $\sqrt 2(\sqrt 2+4i)-4i(\sqrt 2+4i)$ Step 3: $2+4i\sqrt 2-4i\sqrt 2-16i^{2}$ Step 4: $2-16(-1)$ Step 5: $2+16$ Step 6: $18$
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