Gmat prep R=1+2xy

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khurram: Master | Next Rank: 500 Posts; Posts: 231; Joined: Mon Jan 07, 2008 9:39 amFollowed by: 1 member; Thanked: 4 times

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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Source: Beat The GMAT — Problem Solving | Wed May 28, 2008 1:55 pm

netigen: Legendary Member; Posts: 631; Joined: Mon Feb 18, 2008 11:57 pmFollowed by: 3 members; Thanked: 29 times

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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khurram: Master | Next Rank: 500 Posts; Posts: 231; Joined: Mon Jan 07, 2008 9:39 amFollowed by: 1 member; Thanked: 4 times

by khurram » Wed May 28, 2008 4:23 pm

i realize my mistake

thanks
khurram

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