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

It is currently 01 Oct 2014, 14:20

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

Is x^2 equal to xy? (1) x2 y2 = (x + 5)(y - 5) (2) x = y

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 05 Jan 2008
Posts: 709
Followers: 2

Kudos [?]: 103 [0], given: 0

Is x^2 equal to xy? (1) x2 y2 = (x + 5)(y - 5) (2) x = y [#permalink] New post 20 May 2008, 23:44
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Is x^2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

Director
Director
avatar
Joined: 14 Aug 2007
Posts: 735
Followers: 7

Kudos [?]: 103 [0], given: 0

Re: DS: X^2 [#permalink] New post 20 May 2008, 23:57
prasannar wrote:
Is x^2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y



D,

1) Assuming x2 - y2 is a typo for x^2-y^2,

(x+y)(x-y) = (-5 + y) (x - (-5) )
i.e. x =-5 & y = -5

2) is suff
SVP
SVP
avatar
Joined: 04 May 2006
Posts: 1941
Schools: CBS, Kellogg
Followers: 18

Kudos [?]: 294 [0], given: 1

Premium Member CAT Tests
Re: DS: X^2 [#permalink] New post 21 May 2008, 00:01
alpha_plus_gamma wrote:
(x+y)(x-y) = (-5 + y) (x - (-5) )
i.e. x =-5 & y = -5


you seem right! :lol:
_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Director
Director
avatar
Joined: 05 Jan 2008
Posts: 709
Followers: 2

Kudos [?]: 103 [0], given: 0

Re: DS: X^2 [#permalink] New post 21 May 2008, 01:49
Given OA is B.

I too picked D and got nailed down by the OA.

Patman how did you get to B, plz explain
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

VP
VP
User avatar
Joined: 18 May 2008
Posts: 1300
Followers: 13

Kudos [?]: 117 [0], given: 0

Re: DS: X^2 [#permalink] New post 21 May 2008, 03:34
(1)x^2-y^2=(x+y)(x-y)=(x + 5)(y - 5)
so y=5 but no information abt x so insufficient

(2) x=y
multiplying both sides by x
x^2=xy sufficient
So answer should be B
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3404
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 162 [0], given: 2

Re: DS: X^2 [#permalink] New post 21 May 2008, 05:52
this should be B..

x^2-y^2=(x-y)(x+y)..

we have (x+5)(y-5)... (y-5) is not equal to (x-y)

here x is negative...so insuff
Re: DS: X^2   [#permalink] 21 May 2008, 05:52
    Similar topics Author Replies Last post
Similar
Topics:
Is x^2 equal to xy? (1) x^2 y^2 = (x + 5)(y - 5) (2) x = y Nihit 5 21 Oct 2008, 08:41
Is X^2 equal to xy? I. x^2 - y^2 = (x+5)(y-5) II. x=y zhenmaster 5 16 Apr 2008, 09:27
Experts publish their posts in the topic Is x^2 equal to xy? (1) x^2 y^2 = (x + 5)(y - 5) (2) x = y Skewed 5 26 Nov 2007, 10:50
Is x^2 equal to xy? 1) x^2 - y^2 = (x+5)(y-5) 2) x=y jjhko 10 26 Feb 2007, 16:38
Is x^2 equal to xy? (1) x^2-y^2 = (x + 5)(y - 5) (2) x = y Yurik79 9 09 Feb 2006, 06:09
Display posts from previous: Sort by

Is x^2 equal to xy? (1) x2 y2 = (x + 5)(y - 5) (2) 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®.