Answer
$a.) \ 25$
$b.) \ -25$
$c.) \ 50$
Work Step by Step
$a.)$ $(-5)^2 = (-5)(-5) = 25$
$b.)$ $-5^2 = -(5)(5) = -25$
$c.)$ $2 \cdot 5^2 = 2\cdot5\cdot5 = 2\cdot 25 = 50$
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