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# If x0 and ,x=sq. root of (4xy-4y^2) then, in terms of y,

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Manager
Joined: 05 Sep 2007
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Location: New York
If x0 and ,x=sq. root of (4xy-4y^2) then, in terms of y,  [#permalink]

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11 Mar 2008, 18:54
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If x≠0 and ,x=sq. root of (4xy-4y^2) then, in terms of y, x=?
(A) 2y
(B) y
(C)
(D)
(E) –2y

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Senior Manager
Joined: 15 Aug 2007
Posts: 252

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Schools: Chicago Booth

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11 Mar 2008, 19:56
A

Square on both sides and the equation becomes (x-2y)^2=0 => x=2y

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Director
Joined: 14 Aug 2007
Posts: 726

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11 Mar 2008, 20:23
el1981 wrote:
If x≠0 and ,x=sq. root of (4xy-4y^2) then, in terms of y, x=?
(A) 2y
(B) y
(C)
(D)
(E) –2y

A. results in x^2-4xy+4y^2=0 => (x-2y)^2 = 0 => x = 2y

Kudos [?]: 220 [0], given: 0

CEO
Joined: 29 Mar 2007
Posts: 2553

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11 Mar 2008, 20:52
1
KUDOS
el1981 wrote:
If x≠0 and ,x=sq. root of (4xy-4y^2) then, in terms of y, x=?
(A) 2y
(B) y
(C)
(D)
(E) –2y

x=sqrt(4xy-4y^2) --> x^2=4xy-4y^2 --> x^2-4xy+4y^2=0 --> (x-2y)(x-2y)=0

x=2y

A

Kudos [?]: 528 [1], given: 0

Re: PS: X,Y   [#permalink] 11 Mar 2008, 20:52
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