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If m is an integer and x^m = 1/x^m, what is the value of x?

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Math Expert
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Joined: 02 Sep 2009
Posts: 56271
If m is an integer and x^m = 1/x^m, what is the value of x?  [#permalink]

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New post 25 Sep 2018, 05:28
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A
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E

Difficulty:

  55% (hard)

Question Stats:

50% (01:38) correct 50% (01:26) wrong based on 56 sessions

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Math Expert
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Joined: 02 Aug 2009
Posts: 7764
If m is an integer and x^m = 1/x^m, what is the value of x?  [#permalink]

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New post 25 Sep 2018, 23:48
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Bunuel wrote:
If m is an integer and \(x^m = \frac{1}{x^m}\), what is the value of x?

(1) x is an integer.
(2) m in a non-zero integer



with 75% wrong, it means that we tend to overlook few possibilities while taking value of a variable..

\(x^m = \frac{1}{x^m}..............x^{2m}=1\)
since m is an integer, possibilities
a) m is 0, and x can be any value
b) \(m\neq{0}\), and x can be -1 or 1

let us see the statements

(1) x is an integer.
both cases (a) and (b) possible
x = 2, and m= 0 ......possible
x = 1, and m= 10.....possible
insuff

(2) m in a non-zero integer
x can be 1 or -1
insuff

combined
x can still be 1 or -1
insuff

E
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If m is an integer and x^m = 1/x^m, what is the value of x?   [#permalink] 25 Sep 2018, 23:48
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