This should be easy but is driving me nuts.
if 0<x<y what is the value of (x+y)^2/(x-y)^2
1. x^2 +y^2 = 3xy
2. xy =3
GMAT prep
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Is answer B?
1) not sufficient
2) plugging in xy=3 into the question...
(x^2+2(9)+y^2)/(x^2-2(9)+y^2)=
(x^2+y^2)/(x^2+y^2)=
=1
Am I missing something? Can anything be done with the information given in 1)?
1) not sufficient
2) plugging in xy=3 into the question...
(x^2+2(9)+y^2)/(x^2-2(9)+y^2)=
(x^2+y^2)/(x^2+y^2)=
=1
Am I missing something? Can anything be done with the information given in 1)?
- jayhawk2001
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Is it A ?rajt wrote:This should be easy but is driving me nuts.
if 0<x<y what is the value of (x+y)^2/(x-y)^2
1. x^2 +y^2 = 3xy
2. xy =3
1 - sufficient.
(x^2 + y^2 + 2xy) / (x^2 + y^2 - 2xy)
= 5xy / xy
= 5
2 - insufficient. Cannot simplify beyond (x^2 + y^2 + 6) / (x^2 + y^2 - 6)
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My answer is same as Jay....it should be A
Statement A:
(x+y)^2 =x^2+y^2+2xy
(x-y)^2=x^2+y^2-2xy
So 3xy+2xy / 3xy-2xy = 5xy/xy = 5
Statement B: Insufficient
Hence A
Statement A:
(x+y)^2 =x^2+y^2+2xy
(x-y)^2=x^2+y^2-2xy
So 3xy+2xy / 3xy-2xy = 5xy/xy = 5
Statement B: Insufficient
Hence A