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What is the value of x ?

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What is the value of x ? [#permalink] New post 05 Jan 2014, 09:35
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What is the value of x ?

(1) x^2+x+10=16

(2) x=4y^4+2y^2+3
[Reveal] Spoiler: OA

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Re: What is the value of x ? [#permalink] New post 05 Jan 2014, 09:46
cssk wrote:
What is the value of x ?

(1) x^2+x+10=16

(2) x=4y^4+2y^2+3


Statement 1) x^2 + x -6 = 0 => (x-2) * (x+3) = 0 so x can be 2 or -3. Not Sufficient.
Statement 2) x cannot be determined as value of y we don't know. Not Sufficient.

Combining the two statements, from Statment 2) we can see x has to be +ve. So using statement 1) x can take only one value = 2
Sufficient . option C)
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Re: What is the value of x ? [#permalink] New post 05 Jan 2014, 09:51
Expert's post
The question is flawed. On the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other or the stem.

What is the value of x ?

(1) x^2+x+10=16 --> x=-3 or x=2. Not sufficient.

(2) x=4y^4+2y^2+3. Clearly insufficient, though from this statement we can get that since x=4y^4+2y^2+3=(nonnegative)+(nonnegative)+(positive), then the least value of x is 3. Not sufficient.

(1)+(2) The statements above contradict each other.

Ignore this question.
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Manager
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Re: What is the value of x ? [#permalink] New post 05 Jan 2014, 09:55
Alright Bunuel.

Thanks for clearing it up. :-D
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Re: What is the value of x ?   [#permalink] 05 Jan 2014, 09:55
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