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# What is the value of X^2 -Y^2?

Author Message
Manager
Joined: 25 Sep 2018
Posts: 186
Location: United States (CA)
Concentration: Finance, Strategy
GMAT 1: 640 Q47 V30
GPA: 3.97
WE: Investment Banking (Investment Banking)
What is the value of X^2 -Y^2?  [#permalink]

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03 Feb 2019, 03:33
00:00

Difficulty:

55% (hard)

Question Stats:

50% (00:50) correct 50% (00:17) wrong based on 14 sessions

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What is the value of $$X^2$$ -$$Y^2$$?

1.$$x+y=2x$$
2.$$x+y=0$$

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Manager
Joined: 25 Sep 2018
Posts: 186
Location: United States (CA)
Concentration: Finance, Strategy
GMAT 1: 640 Q47 V30
GPA: 3.97
WE: Investment Banking (Investment Banking)
What is the value of X^2 -Y^2?  [#permalink]

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03 Feb 2019, 03:38
My doubt here:
1. x+ y= 2x
simplifies to x(x-y)= 0
Here x can also be zero, but according to GMAT prep, only (x-y) = 0
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Manager
Joined: 07 Aug 2017
Posts: 60
Location: India
GPA: 4
WE: Information Technology (Consulting)
Re: What is the value of X^2 -Y^2?  [#permalink]

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03 Feb 2019, 03:48
1
Abhi077 wrote:
What is the value of $$X^2$$ -$$Y^2$$?

1.$$x+y=2x$$
2.$$x+y=0$$

Statement 1:
$$x+y=2x$$
$$y=x$$

$$x^2 - y^2 = (x+y)(x-y)=0*2x=0$$

Statement 2:
$$x+y=0$$

$$x^2 - y^2 = (x+y)(x-y)=0*(x-y)=0$$

Ans - D
------------------------------------------------------------
Math Expert
Joined: 02 Sep 2009
Posts: 52910
Re: What is the value of X^2 -Y^2?  [#permalink]

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03 Feb 2019, 07:30
Abhi077 wrote:
What is the value of $$X^2$$ -$$Y^2$$?

1.$$x+y=2x$$
2.$$x+y=0$$

Discussed here: https://gmatclub.com/forum/what-is-the- ... fl=similar
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Re: What is the value of X^2 -Y^2?   [#permalink] 03 Feb 2019, 07:30
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