Answer
$-6$
Work Step by Step
$6^2 = 36$. Then, put the negative sign in front of 6 because the original negative sign was outside of the square root.
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.