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inequality

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inequality [#permalink] New post 15 Sep 2012, 07:25
Is |X^2| - |Y^2| = |X^2–Y^2|
(1) X > 0
(2) Y < 0
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Re: inequality [#permalink] New post 15 Sep 2012, 07:37
reks5868 wrote:
Is |X^2| - |Y^2| = |X^2–Y^2|
(1) X > 0
(2) Y < 0


Since X^2 and Y^2 are always non-negative, the question translates into "Is X^2-Y^2=|X^2-Y^2|?" or "Is X^2-Y^2\geq0, which is equivalent to X^2\geq{Y^2}?"

Obviously, the given information, even the two statements together, is not sufficient to answer the question.

Answer E.
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Re: inequality   [#permalink] 15 Sep 2012, 07:37
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