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

It is currently 19 Aug 2014, 21:34

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 greater than x ? (1) x^2 is greater than 1. (2) x is

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
VP
VP
User avatar
Joined: 03 Apr 2007
Posts: 1377
Followers: 3

Kudos [?]: 168 [0], given: 10

GMAT Tests User Reviews Badge
Is x^2 greater than x ? (1) x^2 is greater than 1. (2) x is [#permalink] New post 15 May 2008, 17:16
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
8. Is x^2 greater than x ?
(1) x^2 is greater than 1.
(2) x is greater than –1

I dont agree with the OA.Please explain your answers. I will post the OA later.
Senior Manager
Senior Manager
avatar
Joined: 20 Feb 2008
Posts: 296
Location: Bangalore, India
Schools: R1:Cornell, Yale, NYU. R2: Haas, MIT, Ross
Followers: 4

Kudos [?]: 26 [0], given: 0

GMAT Tests User
Re: DS -x square [#permalink] New post 15 May 2008, 17:24
I would say the answer is E
From the queston we have is x^2>x, this is true if x>1 and for x<0

From 1
x^2>1
x>1 or x>-1, this is insufficient

From 2
x>-1,
if x>-1 then we have a MAYBE situation where x^2>1 or x^2<1
so insufficient

Together 1 and 2
x>-1, this is insufficient
Intern
Intern
avatar
Joined: 04 May 2008
Posts: 8
Followers: 0

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

Re: DS -x square [#permalink] New post 15 May 2008, 17:42
goalsnr wrote:
8. Is x^2 greater than x ?
(1) x^2 is greater than 1.
(2) x is greater than –1

I dont agree with the OA.Please explain your answers. I will post the OA later.


I use the decision tree to solve DS questions as followed:
- Is statement (1) alone is sufficient?
Yes, ie. if x = 2 then x^2=4 > 2=x
Then we eliminate answer choices: B, C, E.
- Is statement (2) alone is sufficient?
No, it isn't sufficient. Because if x>-1 then x^2 may be greater than x (-1<x<0 or x>1) or smaller than x (0<x<1).
Then we eliminate D. The answer is A.
VP
VP
User avatar
Joined: 03 Apr 2007
Posts: 1377
Followers: 3

Kudos [?]: 168 [0], given: 10

GMAT Tests User Reviews Badge
Re: DS -x square [#permalink] New post 15 May 2008, 19:11
nvhungtct wrote:
goalsnr wrote:
8. Is x^2 greater than x ?
(1) x^2 is greater than 1.
(2) x is greater than –1

I dont agree with the OA.Please explain your answers. I will post the OA later.


I use the decision tree to solve DS questions as followed:
- Is statement (1) alone is sufficient?
Yes, ie. if x = 2 then x^2=4 > 2=x
Then we eliminate answer choices: B, C, E.
- Is statement (2) alone is sufficient?
No, it isn't sufficient. Because if x>-1 then x^2 may be greater than x (-1<x<0 or x>1) or smaller than x (0<x<1).
Then we eliminate D. The answer is A.



Yes, ie. if x = 2 then x^2=4 > 2=x
>>> x can be 2 or -2. -> suff 1 insuff
Intern
Intern
avatar
Joined: 04 May 2008
Posts: 8
Followers: 0

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

Re: DS -x square [#permalink] New post 15 May 2008, 19:34
goalsnr wrote:


Yes, ie. if x = 2 then x^2=4 > 2=x
>>> x can be 2 or -2. -> suff 1 insuff


I mean: the statement (1): x^2 > 1, so x <-1 or x>1
then we always have: x^2 > x.
So (1) alone is sufficent.
SVP
SVP
avatar
Joined: 28 Dec 2005
Posts: 1593
Followers: 2

Kudos [?]: 68 [0], given: 2

GMAT Tests User
Re: DS -x square [#permalink] New post 16 May 2008, 03:38
i agree, i get A as well.

from stat 1, if x^2>1, then either x>1 or x<-1 ... in either case, x^2 will always be greater than x (pick some numbers to see this)

from stat 2, if x=0, then statement isnt true, but if x>1, it is ... so insuff.
VP
VP
User avatar
Joined: 03 Apr 2007
Posts: 1377
Followers: 3

Kudos [?]: 168 [0], given: 10

GMAT Tests User Reviews Badge
Re: DS -x square [#permalink] New post 16 May 2008, 04:56
nvhungtct wrote:
goalsnr wrote:


Yes, ie. if x = 2 then x^2=4 > 2=x
>>> x can be 2 or -2. -> suff 1 insuff


I mean: the statement (1): x^2 > 1, so x <-1 or x>1
then we always have: x^2 > x.
So (1) alone is sufficent.


Ok .Now I get it. The OA is A
1 KUDOS received
Manager
Manager
avatar
Joined: 11 Apr 2008
Posts: 157
Schools: Kellogg(A), Wharton(W), Columbia(D)
Followers: 1

Kudos [?]: 55 [1] , given: 0

Re: DS -x square [#permalink] New post 16 May 2008, 05:20
1
This post received
KUDOS
goalsnr wrote:
8. Is x^2 greater than x ?
(1) x^2 is greater than 1.
(2) x is greater than –1

I dont agree with the OA.Please explain your answers. I will post the OA later.

I feel that in such questions, plugging values directly is an easier option than solving/simplifying the equations.
Just identify the boundary conditions and plug both sides.

Eg.
For Stt1: Plug -2 and +1 => since it works for both. This is most probably sufficient. (You cannot be definite by plugging just 2 values. But a statement like this might be easy to visualise after 2 values have been plugged)
For Stt2: Plug +0.5 and -0.5 => since it fails for one and works for the other, thus it is definitely insufficient.

So we have answer A.
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 158 [0], given: 2

GMAT Tests User
Re: DS -x square [#permalink] New post 16 May 2008, 06:30
i get A for this..

x^2>x?

in other words |x|>1?

1) x^2>1... yes.. x=-2 x^2=4..x=2 x^2=4..

2) insuff x could be a fraction .025 for example..
Re: DS -x square   [#permalink] 16 May 2008, 06:30
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Is x^2>x (1) x^2 is greater than 1 (2) x is greater than -1 TomB 1 14 May 2012, 09:39
Is x^2 greater than x? (1) x^2 is greater than x^3 (2) x^2 lumone 2 03 Jun 2008, 07:21
Is x^2 greater than x? (1) x^2 is greater than 1. (2) x is ritula 2 21 May 2008, 02:13
Is x^2 greater than x? 1) x^2 is greater than 1. 2) x is jimmyjamesdonkey 4 21 Apr 2008, 18:24
Is x^2 greater than x? 1) x^2 is greater than 1 2) x is netcaesar 5 18 Oct 2006, 12:24
Display posts from previous: Sort by

Is x^2 greater than x ? (1) x^2 is greater than 1. (2) x is

  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®.