To find -a^-2, we substitute a = -5 into the expression:
-a^-2 = -( -5 )^-2
Since a negative number raised to an even exponent is always positive, we have:
-( -5 )^-2 = -(-5)^-2
= -1/(-5)^2
= -1/25
Therefore, the answer is C. -1/25.
What is -a^-2 if a = -5
A. -25
B. 25
C. -1/25
D. 1/25
1 answer