Find all School-related info fast with the new School-Specific MBA Forum

It is currently 29 Aug 2014, 00:20

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Does x = y ?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
1 KUDOS received
Manager
Manager
avatar
Joined: 21 May 2011
Posts: 243
Followers: 0

Kudos [?]: 68 [1] , given: 8

Does x = y ? [#permalink] New post 24 Jul 2011, 14:32
1
This post received
KUDOS
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

35% (01:29) correct 65% (00:28) wrong based on 31 sessions
Does x = y ?

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

(2) (x+y)^2=0
[Reveal] Spoiler: OA
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 2047
Followers: 128

Kudos [?]: 903 [0], given: 376

GMAT Tests User
Re: DS - 700 level - equation [#permalink] New post 24 Jul 2011, 15:12
bschool83 wrote:
Does x = y ?

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

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


x=0, y=0
OR
x=1, y=-1

Not Sufficient

Ans: "E"
_________________

~fluke

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Intern
Intern
avatar
Joined: 15 Mar 2010
Posts: 11
Followers: 0

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

Re: DS - 700 level - equation [#permalink] New post 24 Jul 2011, 20:58
Does x = y ?

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

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


ans: stmt1: x^2=y^2 doesn't tell us whether x = y as both positive and negative values are possible. insuff

Stmt2: x+y = 0 gives x = -y.

Note: Just saw fluke's answer, yes x and y can be both zero. Hence E.
Senior Manager
Senior Manager
avatar
Joined: 12 Oct 2011
Posts: 276
Followers: 0

Kudos [?]: 21 [0], given: 110

Re: Does x = y ? (1) x^2-y^2=0 (2) (x+y)^2=0 [#permalink] New post 04 Jan 2012, 01:05
Does x = y ?

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

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

Question: Does x = y?

Statement 1: x^2 = y^2
This can be true when x = y = 0 and when x = 1, y = -1. Two different answers can be derived. Thus INSUFFICIENT

Statement 2: x + y = 0 (Taking root on both sides)
Again, this can be true when x = y = 0 and when x = 1, y = -1. Two different answers can be derived. Thus INSUFFICIENT

Combining the two statements, we still have the same dilemma. Both the values of x and y shown above satisfy both the given statements. Two different answers can be derived. Thus INSUFFICIENT

Answer: E
_________________

Consider KUDOS if you feel the effort's worth it

Senior Manager
Senior Manager
User avatar
Joined: 19 Apr 2011
Posts: 291
Schools: Booth,NUS,St.Gallon
Followers: 4

Kudos [?]: 73 [0], given: 51

GMAT Tests User
Re: Does x = y ? (1) x^2-y^2=0 (2) (x+y)^2=0 [#permalink] New post 04 Jan 2012, 07:25
the question just asks whether a=b ..If we are able to prove that a is not equal to b that will be enough .
From statement 2 ..we can deduce that a and b are of opposite signs .Hence they are not equal .
Hence statement 2 alone is sufficient .Answer is not E .

Answer B
_________________

+1 if you like my explanation .Thanks :)

Senior Manager
Senior Manager
avatar
Joined: 12 Oct 2011
Posts: 276
Followers: 0

Kudos [?]: 21 [0], given: 110

Re: Does x = y ? (1) x^2-y^2=0 (2) (x+y)^2=0 [#permalink] New post 04 Jan 2012, 20:57
saikarthikreddy wrote:
the question just asks whether a=b ..If we are able to prove that a is not equal to b that will be enough .
From statement 2 ..we can deduce that a and b are of opposite signs .Hence they are not equal .
Hence statement 2 alone is sufficient .Answer is not E .

Answer B

It is not necessary from Statement 2 for x and y to have opposite signs. If x = 0, y = 0, then x + y = 0. In this case, x = y. That is why the answer is E, not B.
_________________

Consider KUDOS if you feel the effort's worth it

Manager
Manager
User avatar
Joined: 29 Jul 2011
Posts: 111
Location: United States
Followers: 3

Kudos [?]: 33 [0], given: 6

GMAT Tests User
Re: Does x = y ? (1) x^2-y^2=0 (2) (x+y)^2=0 [#permalink] New post 06 Jan 2012, 17:45
Nice one.

1. Here, it could be x=y=0,1,2... or x=1 and y=-1. Insuff
2. Here, it could be x=y=0 or x=1, y=-1. Insuff.

Together, nothing conclusive. E.
_________________

I am the master of my fate. I am the captain of my soul.
Please consider giving +1 Kudos if deserved!

DS - If negative answer only, still sufficient. No need to find exact solution.
PS - Always look at the answers first
CR - Read the question stem first, hunt for conclusion
SC - Meaning first, Grammar second
RC - Mentally connect paragraphs as you proceed. Short = 2min, Long = 3-4 min

Re: Does x = y ? (1) x^2-y^2=0 (2) (x+y)^2=0   [#permalink] 06 Jan 2012, 17:45
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic If wxy ≠ 0, does x = y ? gmatgambler 3 07 Dec 2013, 23:08
Experts publish their posts in the topic Does x^2 = y ? jlgdr 3 18 Sep 2013, 13:40
1 Does x = y ? gmat1220 7 15 May 2011, 01:17
3 Experts publish their posts in the topic If y does not equal 0. Does x = 0 ? rxs0005 5 06 Jan 2011, 05:32
If x and y are integers and y = |x + 3| + |4 x |, does y Vlad77 2 23 Jul 2007, 22:56
Display posts from previous: Sort by

Does x = y ?

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.