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IF R=1+2xy+(x^2)(y^2), what is the value of xy? (1) R=0 (2)

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IF R=1+2xy+(x^2)(y^2), what is the value of xy? (1) R=0 (2) [#permalink]

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17 Dec 2007, 17:32
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

IF R=1+2xy+(x^2)(y^2), what is the value of xy?

(1) R=0
(2) x>0
Senior Manager
Joined: 16 Apr 2006
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17 Dec 2007, 17:59
It should be A.

R = (xy + 1 )^2= (xy)^2 + 2xy + 1

Stmt 1: R = 0

so xy = -1.

stmt 2: insufficient.
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Re: Data suff - value xy [#permalink]

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17 Dec 2007, 19:07
mbsnyc wrote:
IF R=1+2xy+(x^2)(y^2), what is the value of xy?

(1) R=0
(2) x>0

xy=?

X^2Y^2+2xy+1 --> (xy+1)(xy+1)=R

1: R=0

xy=-1 in both cases so suff.

2: doesnt really do anything.

A
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17 Dec 2007, 19:26
Got A: x^2*y^2 + 2xy + 1 = (xy + 1)(xy + 1)

I. Suff: xy + 1 = 0 --> xy = -1
II. Ins.
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