Answer
$(3i)^4=81$
Work Step by Step
Use: $i^2=-1$
$(3i)^4=3^4i^4=81(i^2)^2=81(-1)^2=81$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - 1.5 - Complex Numbers - 1.5 Exercises - Page 120: 85
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