Answer
$53i$
Work Step by Step
Step 1: $i(2+7i)(2-7i)$
Step 2: $i(2(2-7i)+7i(2-7i))$
Step 3: $i(4-14i+14i-49i^{2})$
Step 4: $i(4-49(-1))$
Step 5: $i(4+49)$
Step 6: $53i$
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: 76
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