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pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pmFollowed by: 5 members; Thanked: 33 times

by pradeepkaushal9518 » Tue May 11, 2010 3:40 am

does x=3?
1.x2-6x-18=3
2.x2-6x+9=0

Last edited by pradeepkaushal9518 on Tue May 11, 2010 8:53 am, edited 1 time in total.

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Source: Beat The GMAT — Data Sufficiency | Tue May 11, 2010 3:40 am

GauravMalhotra: Junior | Next Rank: 30 Posts; Posts: 14; Joined: Fri May 07, 2010 3:54 am; Thanked: 1 times; GMAT Score:690

by GauravMalhotra » Tue May 11, 2010 3:44 am

Answer: both a and b alone are sufficient.

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liferocks: Legendary Member; Posts: 576; Joined: Sat Mar 13, 2010 8:31 pmFollowed by: 1 member; Thanked: 97 times

by liferocks » Tue May 11, 2010 4:16 am

is the question complete?..
it looks like something is missing from option 2

"If you don't know where you are going, any road will get you there."
Lewis Carroll

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jaskaran: Senior | Next Rank: 100 Posts; Posts: 61; Joined: Mon Nov 09, 2009 3:52 am; Location: India

by jaskaran » Tue May 11, 2010 5:31 am

yea I agree with gaurav, d is the answer. Pls confirm?

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shashank.ism: Legendary Member; Posts: 1022; Joined: Mon Jul 20, 2009 11:49 pmFollowed by: 2 members; Location: Gandhinagar; Thanked: 41 times

by shashank.ism » Tue May 11, 2010 6:16 am

pradeepkaushal9518 wrote:does x=3?
1.x2-6x-18=3
2.x2-6x+9

statement 1. x2 - 6x - 18 = 3 --> x2 - 6x- 21 =0 so x=/= 3
statement 2. missing sth in here guys.

so I go for E

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2011mbaspirant: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Mon Mar 01, 2010 5:57 pm; Location: US; Thanked: 1 times; GMAT Score:640

by 2011mbaspirant » Wed May 12, 2010 2:28 pm

IMO the answer is B. Statement 1 does not satisfy the condition.

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[email protected]: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Mon Apr 26, 2010 9:30 pm; Location: Johannesburg, South Africa

by [email protected] » Thu May 13, 2010 2:20 pm

shashank.ism wrote:
pradeepkaushal9518 wrote:does x=3?
1.x2-6x-18=3
2.x2-6x+9
statement 1. x2 - 6x - 18 = 3 --> x2 - 6x- 21 =0 so x=/= 3
statement 2. missing sth in here guys.

so I go for E

:mrgreen:

statement 2:

x2-3x-3x+9=0
x(x-3)-3(x-3)=0
(x-3)(x-3)=0 or sqr(x-3) = 0

ANSWER (B)

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analyst218: Master | Next Rank: 500 Posts; Posts: 140; Joined: Fri Feb 05, 2010 2:43 pm; Thanked: 3 times; GMAT Score:720

by analyst218 » Thu May 13, 2010 3:31 pm

pradeepkaushal9518 wrote:does x=3?
1.x2-6x-18=3
2.x2-6x+9=0

1 and 2 contradict each other..

1 says x=/ 3 and 2 says x=3..

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[email protected]: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Mon Apr 26, 2010 9:30 pm; Location: Johannesburg, South Africa

by [email protected] » Thu May 13, 2010 11:30 pm

analyst218 wrote:
pradeepkaushal9518 wrote:does x=3?
1.x2-6x-18=3
2.x2-6x+9=0
1 and 2 contradict each other..

1 says x=/ 3 and 2 says x=3..

how do the statements contradict each other? if one looks at statement 2, the answer is 'yes'.

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pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pmFollowed by: 5 members; Thanked: 33 times

by pradeepkaushal9518 » Fri May 14, 2010 10:11 am

answer is B as only 2 is sufficient to give answer

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Brian@VeritasPrep: GMAT Instructor; Posts: 1031; Joined: Thu Jul 03, 2008 1:23 pmFollowed by: 255 members; Location: Malibu, CA; Thanked: 716 times; GMAT Score:750

by Brian@VeritasPrep » Fri May 14, 2010 11:26 am

Statements 1 and 2 do contradict each other here.

Statement 1 gives the explicit answer "NO" and Statement 2 gives the explicit answer "YES".

Even just looking at them in the same form, we get:

1) x^2 - 6x = 21

2) x^2 - 6x = -9

Which means that the two statements are contradictory.

The answer as the question is written would be D, since each statement alone gives a definite answer to the overall question. But because those answers are different, this wouldn't be a valid GMAT question - on the exam if you find that your answers conflict, go back to check your work because you likely did something wrong in calculation.

Brian Galvin
GMAT Instructor
Chief Academic Officer
Veritas Prep

Looking for GMAT practice questions? Try out the Veritas Prep Question Bank. Learn More.

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