Answer
$24i\sqrt 7$
Work Step by Step
$8\sqrt(-63)=8\sqrt(9\times-1\times7)=8(\sqrt 9\times\sqrt -1\times\sqrt 7)=8(3i\sqrt 7)=24i\sqrt 7$
We know that $\sqrt -1=i$, because $i^{2}=-1$.
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.