#### Answer

$x=0$ or $x=-4$

#### Work Step by Step

We solve by factoring:
$x^{4}+64x=0$
$x(x^{3}+64)=0$
$x=0$ or $x^{3}+64=0$
$x=0$ or $x=\sqrt[3]{-64}$
$x=0$ or $x=-4$

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$x=0$ or $x=-4$

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