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Senior Manager
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Does X=Y? 1) X^2-Y^2=0 2) (X+Y)^2=0 [#permalink]
 18 Oct 2006, 13:28
Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
Does X=Y?
1) X^2-Y^2=0
2) (X+Y)^2=0
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SVP
Joined: 05 Jul 2006
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Does X=Y?
1) X^2-Y^2=0
2) (X+Y)^2=0
FROM ONE
X, Y COULD BE 1,-1 OR BOTH = ZERO..INSUFF
FROM TWO
X = -Y OR X,Y = ZERO INSUFF
BOTH INSUFF MY ANSWER IS E
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Manager
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B is sufficient. If X,Y were 1,-1 the equation in B would not hold.
They only way to square something and get 0 is if that thing is 0.....so....(x+Y) = 0
The only way for X+Y to equal 0 is if X and Y are the same.
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SVP
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Burningskulls , i believe you meant equal with opposite signs. 
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Director
Joined: 23 Jun 2005
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Does X=Y?
It's B.
Statement 1:
x =+/- y INSUFF
Statement 2:
x+y = 0
x= -y SUFF
Hopefully, I got this one right.
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VP
Joined: 25 Jun 2006
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E.
X = -Y does not say anything. take x = y = 0. and take x = 5 and y = -5.
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SVP
Joined: 24 Aug 2006
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tennis_ball wrote: B is not suff. I dispute the OA.
I'm getting E as well.
X=Y=0
or
X=1 and Y=-1
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Senior Manager
Joined: 13 Sep 2006
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Same here. This should be E as x and y could be 1, -1 (2, -2 etc...) OR they can both be zero for statement 1 & 2.
Where is this questions from?
_________________
"Never let the fear of striking out get in your wayâ€
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Senior Manager
Joined: 22 Sep 2005
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I understand you.
I put E too, but OA I have is B.
Perhaps there is a mistake.
I will put E.
Thanks to everybody.
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Senior Manager
Joined: 30 Aug 2006
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E.
i) x^2 = y^2 INS
ii) (x+y)^2 = 0
x + y = 0
x = -y , i.e. x could = -5 and y = 5, or they could both be 0 INS
both INS
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SVP
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I agree with the majority. x=-y doesn't mean that they cannot equal, unless it is specified that they are non zero.
_________________
Keep on asking, and it will be given you;
keep on seeking, and you will find;
keep on knocking, and it will be opened to you.
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