Answer
$$8j.$$
Work Step by Step
We have
$$\sqrt{-64}=\sqrt{(-1)(64)}=\sqrt{-1} \sqrt{64}=8j.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 11 - Section 11.5 - Imaginary Numbers - Exercise - Page 378: 2
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