Answer
$ 0,\pm\sqrt 2$
Work Step by Step
$4z^3-8z=0$,
$4z(z^2-2)=0$,
thus $z=0,\pm\sqrt 2$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.8 Solving Equations - A.8 Assess Your Understanding - Page A70: 32
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