Answer
$|-7i|=7$
Work Step by Step
$z=-7i$
$|a+bi|=\sqrt {a^2+b^2}$
$|-7i|=|0-7i|=\sqrt {0^2+(-7)^2}=\sqrt {49}=7$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 8 - 8.5 - The Complex Plane - 8.5 Exercises - Page 603: 15
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