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Source: — Data Sufficiency |
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by niraj_a » Tue Jul 14, 2009 5:46 pm
A should be good.

(x+y)^2 = x^2 + 2xy + y^2
(x-y)^2 = x^2 - 2xy + y^2

so,

x^2 + 2xy + y^2 / x^2 - 2xy + y^2

substituting 3xy we get,

3xy + 2xy / 3xy - 2xy

= -1
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by shibal » Tue Jul 14, 2009 5:49 pm
plug in values for x and y, and u'll see A is suff...
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