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 $x=-4$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.