Asked by Deborah
what is -a^-2 if a=-5?
A.)-25
B.)25
C.)-1/25
D.)1/25
I think it is D.
Please help.
A.)-25
B.)25
C.)-1/25
D.)1/25
I think it is D.
Please help.
Answers
Answered by
Steve
a^-2 = 1/a^2, so
(C)
(C)
Answered by
Deborah
even though that is -a? you wrote it as positive a to the -2 power = 1/a to the 2nd ...just making sure
Answered by
Steve
yes. the "-" is done after the ^-2
-a^-2 = -(a^-2) = -1/a^2
(-a)^-2 = 1/(-a)^2 = 1/a^2
-a^-2 = -(a^-2) = -1/a^2
(-a)^-2 = 1/(-a)^2 = 1/a^2
Answered by
Deborah
Thank you for the explanation - that really helps....
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