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If m=−2, what is −m^−m?

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If m=−2, what is −m^−m? [#permalink] New post 19 Dec 2012, 22:27
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A
B
C
D
E

Difficulty:

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Question Stats:

36% (01:39) correct 64% (00:22) wrong based on 61 sessions
If m=−2, what is −m^−m?

A. −16
B. −4
C. −1/4
D. 1/4
E. 4

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Re: If m=−2, what is [#permalink] New post 19 Dec 2012, 22:29
I thought this to be a poor quality question because they did not mention either - m^-m or (-m)^-m..... i took it for the second one and flipped the sign... Am I being wrong in understanding GMAT presentation?
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Re: If m=−2, what is [#permalink] New post 19 Dec 2012, 22:31
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Amateur wrote:
If m=−2, what is −m^−m?
−16

−4

−1/4

1/4

4


SOurce HULT


This is a pretty simple one that can be solved by substitution. But take it step by step and simplify. But the confusion in the questions is whether the - sign in the base is with 2 or outside. In the absence of bracket, we'll take it outside..

-m^{-m}, m = -2
=> -(2^{-(-2)})
=>-2^2
=-4
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Re: If m=−2, what is [#permalink] New post 19 Dec 2012, 23:30
Amateur wrote:
If m=−2, what is −m^−m?
−16
−4
−1/4
1/4
4


=-(-2)^{-(-2)}=-(-2)^2=-4

Answer: B
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Re: If m=−2, what is [#permalink] New post 20 Dec 2012, 02:11
Expert's post
Amateur wrote:
I thought this to be a poor quality question because they did not mention either - m^-m or (-m)^-m..... i took it for the second one and flipped the sign... Am I being wrong in understanding GMAT presentation?


If it were (-m)^{-m} it would be written as (-m)^{-m} not as -m^{-m}.
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Re: If m=−2, what is −m^−m? [#permalink] New post 25 Mar 2014, 00:52
m = -2 so -m = 2

- (-2)^2

= -4 = Answer
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Re: If m=−2, what is −m^−m?   [#permalink] 25 Mar 2014, 00:52
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