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05 Jan 2014, 10:35
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
51% (01:18) correct
49%
(01:42)
wrong
based on 47
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of x ?
(1) x^2+x+10=16
(2) x=4y^4+2y^2+3
(1) x^2+x+10=16
(2) x=4y^4+2y^2+3
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05 Jan 2014, 10:46
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cssk
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)
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.
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.
