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X=?

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by GauravMalhotra » Tue May 11, 2010 3:44 am
Answer: both a and b alone are sufficient.
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by liferocks » Tue May 11, 2010 4:16 am
is the question complete?..
it looks like something is missing from option 2
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by jaskaran » Tue May 11, 2010 5:31 am
yea I agree with gaurav, d is the answer. Pls confirm?
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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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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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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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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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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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by pradeepkaushal9518 » Fri May 14, 2010 10:11 am
answer is B as only 2 is sufficient to give answer
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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.
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