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: 77

Answer

$9i+12$

Work Step by Step

Step 1: $3i(2-i)(2-i)$ Step 2: $3i(2(2-i)-i(2-i))$ Step 3: $3i(4-2i-2i+i^{2})$ Step 4: $3i(4-4i+(-1))$ Step 5: $3i(4-4i-1)$ Step 6: $3i(3-4i)$ Step 7: $9i-12i^{2}$ Step 8: $9i-12(-1)$ Step 9: $9i+12$
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