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

It is currently 21 Sep 2014, 22:32

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 > y^2? 1. x > y + 5 2. x^2 - y^2 = 0

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 12 Oct 2008
Posts: 558
Followers: 2

Kudos [?]: 70 [0], given: 2

GMAT Tests User
Is x > y^2? 1. x > y + 5 2. x^2 - y^2 = 0 [#permalink] New post 28 Sep 2009, 17:32
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 > y^2?

1. x > y + 5
2. x^2 - y^2 = 0

Please explain
[Reveal] Spoiler:
OA C IMO E
1 KUDOS received
Manager
Manager
avatar
Joined: 08 Nov 2005
Posts: 182
Followers: 1

Kudos [?]: 13 [1] , given: 10

GMAT Tests User
Re: DS = Inequality [#permalink] New post 28 Sep 2009, 17:43
1
This post received
KUDOS
IMO B.

1.
x=-5, y=-11 is x> y^2->No
x=6, y=0 Ans is Yes
Insufficient

2.
(x-y)(x+y)=0 i.e x=y or x=-y
x=y i.e is x>y^2 NO
x=-y that means only sign is different
y^2 is always positive is x>y^2 NO
plugin numbers: x=1, y=-1 NO
x=-2 y=2 No
x=0 y=0 No
Always No. Sufficient
Manager
Manager
avatar
Joined: 08 Nov 2005
Posts: 182
Followers: 1

Kudos [?]: 13 [0], given: 10

GMAT Tests User
Re: DS = Inequality [#permalink] New post 28 Sep 2009, 17:48
silly mistake. Did not consider fraction for
2. x=y if x=y=1/2 then 1/2 > 1/4 so answer is Yes
so 2 is insufficient too

lets consider together
x=y and x>y+5 this is impossible because we are saying is x>x+5 so we cant consider this.
now x=-y and x>y+5 i.e -2y > 5
for example x=4 y=-4 i.e 8>5
is x>y^2 4 >16 NO
now for any number this will be true.

ANSWER IS C.
whats OA? I hope I am not wrong. I am making tons of silly mistakes lately.
1 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 30 Nov 2008
Posts: 494
Schools: Fuqua
Followers: 10

Kudos [?]: 124 [1] , given: 15

GMAT Tests User
Re: DS = Inequality [#permalink] New post 29 Sep 2009, 08:36
1
This post received
KUDOS
orsang8 wrote:
silly mistake. Did not consider fraction for
2. x=y if x=y=1/2 then 1/2 > 1/4 so answer is Yes
so 2 is insufficient too

lets consider together
x=y and x>y+5 this is impossible because we are saying is x>x+5 so we cant consider this.
now x=-y and x>y+5 i.e -2y > 5
for example x=4 y=-4 i.e 8>5
is x>y^2 4 >16 NO
now for any number this will be true.

ANSWER IS C.
whats OA? I hope I am not wrong. I am making tons of silly mistakes lately.


Nice explanation orsang8. Here is an alternative to part of your explanation.

Your explanation of x = y ruling out is good.

For x = -y and x>y = 5 ==> x > -x+5
==> 2x>5 ==> x> 2.5.

When ever X > 1, X^2 > X ==> Y^2 > X(since X = -Y)

This way with the both the clues, we can say whether X > Y^2. Hence Ans is C.
Manager
Manager
User avatar
Joined: 21 May 2009
Posts: 136
Followers: 1

Kudos [?]: 6 [0], given: 48

Re: DS = Inequality [#permalink] New post 29 Sep 2009, 18:41
yeah Ans C

Good explanation guys
Intern
Intern
avatar
Joined: 30 Aug 2009
Posts: 13
Followers: 0

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

Re: DS = Inequality [#permalink] New post 03 Oct 2009, 00:00
Now ,my way.guys please let me know if it is wrong.

The only situation that makes 2 false is when x=y=1 or x=1 y=-1.
So C.
Intern
Intern
avatar
Joined: 20 Aug 2009
Posts: 11
Followers: 0

Kudos [?]: 1 [0], given: 11

Re: DS = Inequality [#permalink] New post 05 Oct 2009, 14:06
good explanation both mrsmarthi and orsang8. Thanks.
Manager
Manager
avatar
Joined: 05 Jul 2009
Posts: 182
Followers: 1

Kudos [?]: 14 [0], given: 5

Re: DS = Inequality [#permalink] New post 23 Oct 2009, 15:40
abhivarma03 wrote:
Now ,my way.guys please let me know if it is wrong.

The only situation that makes 2 false is when x=y=1 or x=1 y=-1.
So C.



I am afraid it is wrong, as already explained, anything between 0 and 1 also makes 2 not work. Or did you mean something else?
Re: DS = Inequality   [#permalink] 23 Oct 2009, 15:40
    Similar topics Author Replies Last post
Similar
Topics:
6 Experts publish their posts in the topic Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 tonebeeze 9 12 Jul 2010, 16:53
Is x > y^2 ? 1. x > y+5 2. x^2 - y^2 = 0 Economist 5 15 Nov 2009, 02:25
7 Experts publish their posts in the topic Is x > y^2? 1. x > y + 5 2. x^2 - y^2 = 0 sset009 8 02 Sep 2008, 06:41
Experts publish their posts in the topic Is x > y^2 1. x> y+5 2. x^2 - y^2 = 0 bmwhype2 1 02 Dec 2007, 10:52
Experts publish their posts in the topic Is x > y ^ 2? (1) x > y + 5 (2) x^2 - y^2 = 0 eyunni 1 21 Nov 2007, 11:26
Display posts from previous: Sort by

Is x > y^2? 1. x > y + 5 2. x^2 - y^2 = 0

  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®.