Answer
$ x = -i$
$x = i$
$x = -1$
$x = 1$
Work Step by Step
$x^4 -1 = 0$
$(x^2 +1)(x^2 -1) = 0$
$(x^2 - (-1)) (x + 1)(x-1) =0$
$(x + i)(x-i)(x+1)(x-1)=0$
Calculus: Early Transcendentals 8th Edition
by Stewart, James
Published by
Cengage Learning
ISBN 10:
1285741552
ISBN 13:
978-1-28574-155-0
APPENDIX H - Complex Numbers - H Exercises - Page A 64: 20
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