Answer
$(-5)^{2}=25$
Work Step by Step
$(-5)^{2}\qquad$ ...rewrite $-5$ as $(-1)(5)$
$=((-1)(5))^{2}\qquad$ ...use $(ab)^{2}=a^{2}b^{2}$
$=(-1)^{2}(5)^{2}$
$=1\cdot 25$
$=25$
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