What is the value of x? 1) x^3-x=0 2) x^2-x=0 I realize the : DS Archive
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# What is the value of x? 1) x^3-x=0 2) x^2-x=0 I realize the

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What is the value of x? 1) x^3-x=0 2) x^2-x=0 I realize the [#permalink]

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05 Feb 2005, 15:19
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What is the value of x?

1) x^3-x=0
2) x^2-x=0

I realize the answer is E, but to clarify, if you have more than two answers on a value question will that ALWAYS be INSUFFICIENT?
VP
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Re: DS Kaplan book-Will two values on a value question? [#permalink]

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05 Feb 2005, 19:25
willgoldberg wrote:
What is the value of x?

1) x^3-x=0
2) x^2-x=0

I realize the answer is E, but to clarify, if you have more than two answers on a value question will that ALWAYS be INSUFFICIENT?

from i, x could be +ve and -ve. 1 and -1, both, satisfy the equation.

from ii, x is positive. x^2=x is only possible if x=1.
therefore OA is B.
VP
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05 Feb 2005, 19:41
"E".

I. x(x2-1) = 0.....x = 0 or x = 1 or -1....insuff

II x(x-1) = 0....X = 0 or X = 1....insuff

Combine....

x3 -x = x2 -x

x2(x-1) = 0

x = 0 or 1...insuff
SVP
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05 Feb 2005, 20:04
x could be zero too, MA.

Yes, if it is asking for a value, and we can't pin the value down to one exact value, than it would be insufficient.
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07 Feb 2005, 14:03
Should be E as no unique answer even after combining the two.
E   [#permalink] 07 Feb 2005, 14:03
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