Answer
$-1, \quad-i, \quad 1$
Work Step by Step
Since $i=\sqrt{-1}$, then we have
$$
i^2=(\sqrt{-1})^2=-1\\
i^3=(\sqrt{-1})^3=-1\sqrt{-1}=-i\\
i^4=(\sqrt{-1})^4=1
$$
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.11 Complex Numbers - A.11 Assess Your Understanding - Page A94: 5
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