Answer
$-64$
Work Step by Step
Note that $-x^2$ means "the negative of $x^2$."
Thus, the given expression means
$-(8^2)$
Simplifying gives:
$=-(8 \cdot 8)
\\=-64$
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.