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Source: — Data Sufficiency |
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by neelgandham » Thu Jan 12, 2012 10:09 am
If xy=-6, what is the value of xy(x+y)?
1). x-y=5
xy = -6, x-y = 5 then x+y = +1
xy(x+y) = +6 Insufficient
2). xy^2=18
xy=-6, xy^2=18, implies y =-3 and x =2
xy(x+y) = -6(-1) = 6 Sufficient

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