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which of the following is a value of X for which

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Joined: 08 Nov 2008
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which of the following is a value of X for which [#permalink] New post 19 Nov 2008, 18:44
which of the following is a value of X
for which X^11-X^3>0
A. –2
B. –1
C. –1/2
D. 1/2
E. 1
Manager
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Joined: 14 Nov 2008
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Schools: Stanford...Wait, I will come!!!
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Re: value X---25 [#permalink] New post 20 Nov 2008, 04:51
The best way would be to put the value and arrive at the conclusion
logically.. for positive value greater than 1..it will eb always true.
for negative value.. less than -1 it will be always false.. for 1& -1 it will b e false
and for 1/2 it will be false..
so answer is C

gorden wrote:
which of the following is a value of X
for which X^11-X^3>0
A. –2
B. –1
C. –1/2
D. 1/2
E. 1
Manager
Manager
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Joined: 08 Aug 2008
Posts: 234
Followers: 1

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GMAT Tests User
Re: value X---25 [#permalink] New post 20 Nov 2008, 05:03
A.
euation simplifies to X^8>1.
Look at the choices, X<>(1,-1) or any fraction.
Hence x=-2.
Re: value X---25   [#permalink] 20 Nov 2008, 05:03
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