Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 22 May 2013, 09:45
Customize  |  Hide

Search
Register
New posts
Unanswered

Is K^2+K - 2 > 0 A) K < 1 B) K > -2

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Director
Director
Joined: 03 Jul 2003
Posts: 716
Followers: 2

Kudos [?]: 4 [0], given: 0

GMAT Tests User
Is K^2+K - 2 > 0 A) K < 1 B) K > -2 [#permalink] New post 29 Jun 2004, 20:36
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Is K^2+K - 2 > 0

A) K < 1
B) K > -2
Senior Manager
Senior Manager
User avatar
Joined: 21 Mar 2004
Posts: 447
Location: Cary,NC
Followers: 2

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

GMAT Tests User
 [#permalink] New post 29 Jun 2004, 21:07
Let E = k^2+k-2 = (k-1)(k+2)

for E>0 means k-1 and k+2 have to be of same sign...ie either both positive or both negative.

Case 1. Both k-1 and k+2 are positive

k-1>0 , or k>1
and
k+2>0 or K<-2

Case 2. Both k-1 and k+2 are negative

k-1<0 , or k<1
and
k+2<0 or K>-2

Now look at the question stem.
A. k<1
If E>0 , we need more info.......so A is insufficient.

B. k>-2
If E>0 , we need more info.......so B is insufficient.


taking both A and B , it boils down to Case 2.

Therefore answer is C.

- ash
_________________

ash
________________________
I'm crossing the bridge.........

Senior Manager
Senior Manager
Joined: 26 Jan 2004
Posts: 428
Location: India
Followers: 1

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

GMAT Tests User
 [#permalink] New post 30 Jun 2004, 05:54
yeah (C) it is.
(k+2)(k-1)>0
implies
k+2 > , k-1>0 ---> k>-2 K>1 ---> k>-2 (extreme condition)
OR
k+2<0, k-1<0 ---> k<-2 k<1 ----> k<1 (extreme condition)

Hence -2<k<1

Hence (C)
  [#permalink] 30 Jun 2004, 05:54
    Similar topics Author Replies Last post
Similar
Topics:
 New posts Find integer K (1) K=|K|! (2) K^2=|K| Post a full solution. stolyar 4 18 Jun 2003, 23:57
New posts Is k^2 + k - 2 > 0 1, k<1 2, k>-1 macca 6 22 Sep 2005, 04:54
New posts is K^2+K - 2 >0 1>K K>-1 ArvGMAT 6 24 Jul 2007, 21:40
New posts EXPERTS_POSTS_IN_THIS_TOPIC Is k greater than 3? (1) (k - 3)(k- 2)(k - 1) > 0 (2) k tonebeeze 5 08 Oct 2010, 18:55
New posts 2 EXPERTS_POSTS_IN_THIS_TOPIC Is k^2 +k -2 > 0 ? anartey 2 12 Feb 2013, 15:52
Display posts from previous: Sort by

Is K^2+K - 2 > 0 A) K < 1 B) K > -2

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma, IanStewart

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com