Answer
$25i$
Work Step by Step
Step 1: $i(3-4i)(3+4i)$
Step 2: $i(3(3+4i)-4i(3+4i))$
Step 3: $i(9+12i-12i-16i^{2})$
Step 4: $i(9-16(-1))$
Step 5: $i(9+16)$
Step 6: $25i$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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: 75
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