Answer
$ 0,\pm3$
Work Step by Step
$t^3-9t=0$,
$t(t^2-9)=0$,
$t(t+3)(t-3)=0$,
thus $t=0,\pm3$
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.