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# Inequality: GMAT prep

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Senior Manager
Joined: 02 Dec 2007
Posts: 463
Followers: 2

Kudos [?]: 59 [0], given: 6

Inequality: GMAT prep [#permalink]  26 Sep 2008, 11:50
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Director
Joined: 27 Jun 2008
Posts: 547
WE 1: Investment Banking - 6yrs
Followers: 1

Kudos [?]: 48 [0], given: 92

Re: Inequality: GMAT prep [#permalink]  26 Sep 2008, 11:58
D

(1)
Any number^2 = either -or+ will be positive.
x = -2 or +2
x^2 = 4
SUFF

(2)
Let x = 3, y = 2
2*3 - 3*2 < 3^2
0<9...its always true for any +ve number
Manager
Joined: 18 Jan 2008
Posts: 221
Schools: The School that shall not be named
Followers: 3

Kudos [?]: 23 [0], given: 0

Re: Inequality: GMAT prep [#permalink]  26 Sep 2008, 12:56
For B:

Assume X=2, Y=0
Then
$$2X-3Y = 4 X^2=4$$
Since we can see that at the extreme case the 2 sides are equal, it is not hard to see that if $$Y > 0, 2X-3Y<X^2$$
_________________

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Re: Inequality: GMAT prep   [#permalink] 26 Sep 2008, 12:56
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