Answer
$12i\sqrt{2}$
Work Step by Step
The -1 inside the radical is changed to an $i$ outside the radical.
$\sqrt{-288}=12i\sqrt{2}$
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.