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ikaplan: Master | Next Rank: 500 Posts; Posts: 181; Joined: Fri Sep 04, 2009 12:06 pmFollowed by: 1 member; Thanked: 17 times

by ikaplan » Sun Dec 26, 2010 2:44 am

X^2+2X-8=0

(1) X^2=2X

(2) 3X=7X

OA is B

"Commitment is more than just wishing for the right conditions. Commitment is working with what you have."

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Source: Beat The GMAT — Data Sufficiency | Sun Dec 26, 2010 2:44 am

prachich1987: Legendary Member; Posts: 752; Joined: Sun Sep 12, 2010 2:47 amFollowed by: 10 members; Thanked: 20 times; GMAT Score:700

by prachich1987 » Sun Dec 26, 2010 3:08 am

ikaplan wrote:X^2+2X-8=0

(1) X^2=2X

(2) 3X=7X

OA is B

Please check the statement 2 written above...Is it a typo error?

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ikaplan: Master | Next Rank: 500 Posts; Posts: 181; Joined: Fri Sep 04, 2009 12:06 pmFollowed by: 1 member; Thanked: 17 times

by ikaplan » Sun Dec 26, 2010 3:22 am

No, statement 2 is OK. That is why I posted this question. It seems as if there is so much we can learn

"Commitment is more than just wishing for the right conditions. Commitment is working with what you have."

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prachich1987: Legendary Member; Posts: 752; Joined: Sun Sep 12, 2010 2:47 amFollowed by: 10 members; Thanked: 20 times; GMAT Score:700

by prachich1987 » Sun Dec 26, 2010 3:31 am

ikaplan wrote:No, statement 2 is OK. That is why I posted this question. It seems as if there is so much we can learn

X^2+2X-8=0

so x can be -4 or 2.----------I

STATEMENT 1
x can be 0 0r 2.
From I x is 2
Hence x is 2
Sufficient

STATEMENT 2
x is 0
Not sufficient

IMO : A

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Sun Dec 26, 2010 11:41 am

ikaplan wrote:xÂ² + 2x - 8 = 0

(1) xÂ² = 2x
(2) 3x = 7x

Either this question is incomplete or it is flawed.

If we assume that the question is complete and (xÂ² + 2x - 8 = 0) is a given condition and we have to find the value of x, then the question is flawed. This is because from the question stem the value of x is either 2 or -4. But according to statement 2 only possible value of x is 0. Now the two statements of a DS question must assist the original question whether or not they are sufficient to answer the question. In this case statement is simply an arbitrary one and has nothing to do with the actual question. Thus the question is neither a standard GMAT question nor it is a proper "Data Sufficiency" question.

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ikaplan: Master | Next Rank: 500 Posts; Posts: 181; Joined: Fri Sep 04, 2009 12:06 pmFollowed by: 1 member; Thanked: 17 times

by ikaplan » Sun Dec 26, 2010 3:41 pm

Thank you! This question was taken from question bank of a major GMAT prep company. I myself had difficulties in understanding why OA is correct.

"Commitment is more than just wishing for the right conditions. Commitment is working with what you have."

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