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What is the value of x ?

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cssk
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What is the value of x ? [#permalink] New post   05 Jan 2014, 10:35
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A
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55% (hard)

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51% (01:18) correct 49% (01:42) wrong based on 47 sessions
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What is the value of x ?

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

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

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Re: What is the value of x ? [#permalink] New post   05 Jan 2014, 10:46
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, 10:51
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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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Re: What is the value of x ? [#permalink] New post   05 Jan 2014, 10:55
Alright Bunuel.

Thanks for clearing it up. :-D

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Re: What is the value of x ? [#permalink]
05 Jan 2014, 10:55
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Bunuel
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