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# Is integer x greater than integer y?

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Math Expert
Joined: 02 Sep 2009
Posts: 46305
Is integer x greater than integer y? [#permalink]

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12 Sep 2017, 08:02
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Difficulty:

55% (hard)

Question Stats:

58% (00:44) correct 42% (00:50) wrong based on 24 sessions

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Is integer x greater than integer y?

(1) x^2 + 2xy + y^2 = 0
(2) x^2 – 2xy + y^2 = 0

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PS Forum Moderator
Joined: 25 Feb 2013
Posts: 1144
Location: India
GPA: 3.82
Is integer x greater than integer y? [#permalink]

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12 Sep 2017, 08:43
Bunuel wrote:
Is integer x greater than integer y?

(1) x^2 + 2xy + y^2 = 0
(2) x^2 – 2xy + y^2 = 0

Hi Bunuel,

Need some clarity here. From statement 1 it is clear that $$x = -y$$ and from statement 2 it is clear that $$x=y$$. But in a DS question aren't the two statements supposed to lead to the same value of $$x$$ & $$y$$?
Here both the statements are individually sufficient to answer the question stem, but ideally $$x=-y$$ and $$x=y$$ is only possible when we combine these two to get $$y=0$$ & $$x=0$$
Math Expert
Joined: 02 Sep 2009
Posts: 46305
Re: Is integer x greater than integer y? [#permalink]

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12 Sep 2017, 08:48
niks18 wrote:
Bunuel wrote:
Is integer x greater than integer y?

(1) x^2 + 2xy + y^2 = 0
(2) x^2 – 2xy + y^2 = 0

Hi Bunuel,

Need some clarity here. From statement 1 it is clear that $$x = -y$$ and from statement 2 it is clear that $$x=y$$. But in a DS question aren't the two statements supposed to lead to the same value of $$x$$ & $$y$$?
Here both the statements are individually sufficient to answer the question stem, but ideally $$x=-y$$ and $$x=y$$ is only possible when we combine these two to get $$y=0$$ & $$x=0$$

Hints:
1. The statements do not contradict.
2. The answer is not D.
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Senior Manager
Joined: 02 Jul 2017
Posts: 294
GMAT 1: 730 Q50 V38
Re: Is integer x greater than integer y? [#permalink]

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12 Sep 2017, 08:49
Find : is x>y ?

(1) x^2 + 2xy + y^2 = 0
=> (x+y)^2 = 0
=> x+y=0
=> x=-y
Now we dont know if y is negative or positive
if y= +ve , x is -ve and x<y
if y =-ve , x is +ve and x>y
Not sufficient

(2) x^2 – 2xy + y^2 = 0
=> (x-y)^2=0
=> x-y=0
=> x=y
So This implies x is 'not' greater to y but is equal to y.
Sufficient

PS Forum Moderator
Joined: 25 Feb 2013
Posts: 1144
Location: India
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Re: Is integer x greater than integer y? [#permalink]

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12 Sep 2017, 09:00
Bunuel wrote:
niks18 wrote:
Bunuel wrote:
Is integer x greater than integer y?

(1) x^2 + 2xy + y^2 = 0
(2) x^2 – 2xy + y^2 = 0

Hi Bunuel,

Need some clarity here. From statement 1 it is clear that $$x = -y$$ and from statement 2 it is clear that $$x=y$$. But in a DS question aren't the two statements supposed to lead to the same value of $$x$$ & $$y$$?
Here both the statements are individually sufficient to answer the question stem, but ideally $$x=-y$$ and $$x=y$$ is only possible when we combine these two to get $$y=0$$ & $$x=0$$

Hints:
1. The statements do not contradict.
2. The answer is not D.

Thanks got it. I mis-read the question thought that it is asking for the value of x
Manager
Joined: 12 Feb 2017
Posts: 71
Re: Is integer x greater than integer y? [#permalink]

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12 Sep 2017, 09:25
(1) x^2 + 2xy + y^2 = 0
(x+y)^2=0
Two different cases can satisfy above equation
Case I: x=y=0
Case II: x=-y
Hence We can not firmly predict whether x is greater than y. Statement 1 is insufficient.

(2) x^2 – 2xy + y^2 = 0
(x-y)^2=0
x=y
as x and y are equal; we can firmly say that x is not greater than y.
Hence statement II is sufficient.

Kudos if it helps.
Director
Joined: 02 Sep 2016
Posts: 744
Re: Is integer x greater than integer y? [#permalink]

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12 Sep 2017, 12:43
1) (x+y)^2= 0
x=-y

Can be same or can't be.
x=-2 and y=2
or
x= 0 and y=0 (same value)

2) (x-y)^2= 0
x=y

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Re: Is integer x greater than integer y?   [#permalink] 12 Sep 2017, 12:43
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