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Gmat prep R=1+2xy

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Gmat prep R=1+2xy

by khurram » Wed May 28, 2008 1:55 pm
Hello

The Ans is A

We solve as quadratic equation. (xy+1)(xy+2)=0

so xy =-1, -2 so value is 2. IS that how you do it. Do not care what is x and y alone as product.

2 -Insuff as x>0, no clue about y or any value.

Thanks
Khurram
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by netigen » Wed May 28, 2008 2:09 pm
The quadratic eq you will get is

(1+xy)^2 = 0
1+xy = 0
xy = -1

hence A
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by khurram » Wed May 28, 2008 4:23 pm
i realize my mistake

thanks
khurram
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