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

It is currently 23 Oct 2014, 00:06

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 k + k - 2 > 0 (1) k < 1 (2) k > -1

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 02 Oct 2005
Posts: 305
Followers: 1

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

Is k + k - 2 > 0 (1) k < 1 (2) k > -1 [#permalink] New post 09 Nov 2005, 20:24
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 k² + k - 2 > 0
(1) k < 1
(2) k > -1
Senior Manager
Senior Manager
avatar
Joined: 07 Jul 2005
Posts: 405
Followers: 3

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

 [#permalink] New post 09 Nov 2005, 20:33
(1) Insufficient.

If k =0 then k^2 + K -2 < 0
If k = -10 then k^2 + K -2 > 0

(2) Insufficient.

Same reasoning above

(1/2) The boundary is now -1 < k < 1

Which implies that k^2 + K -2 will always be less than 0.

Therefore the answer to the question is NO.

I pick C.
Director
Director
avatar
Joined: 21 Aug 2005
Posts: 795
Followers: 2

Kudos [?]: 7 [0], given: 0

Re: DS: Inequality [#permalink] New post 09 Nov 2005, 20:35
sudhagar wrote:
Is k² + k - 2 > 0
(1) k < 1
(2) k > -1


C
Is (k-1)(k+2)>0
A) Insuff.
k=-2 -> Expression is False
k=-3 -> Expression is True
B Insuff.
k=1 -> Expression is False
k=2 -> Expression is True

Together, -1<k<1
This keeps (k-1) always -ve and (k+2) always +ve. Hence Sufficient.
SVP
SVP
User avatar
Joined: 05 Apr 2005
Posts: 1735
Followers: 3

Kudos [?]: 34 [0], given: 0

Re: DS: Inequality [#permalink] New post 09 Nov 2005, 21:54
gsr wrote:
sudhagar wrote:
Is k² + k - 2 > 0
(1) k < 1
(2) k > -1


C. Is (k-1)(k+2)>0
A) Insuff.
k=-2 -> Expression is False
k=-3 -> Expression is True
B Insuff.
k=1 -> Expression is False
k=2 -> Expression is True

Together, -1<k<1. This keeps (k-1) always -ve and (k+2) always +ve. Hence Sufficient.

Is k² + k - 2 > 0?
or, is (k-1)(k+2)>0?
or, is k>1, and/or k>-2?

from i, k is smaller than 1 but greater than -2. so not suff.
from ii, k is greater than -1 but could be greater than -2. so not suff.

from i and ii, 1>k>-1.
Director
Director
avatar
Joined: 27 Jun 2005
Posts: 517
Location: MS
Followers: 2

Kudos [?]: 16 [0], given: 0

 [#permalink] New post 09 Nov 2005, 22:27
C.

A and B are both insufficient ...
and equation is always < 0 when -1 <k<1 ....hence C
Senior Manager
Senior Manager
User avatar
Joined: 14 Apr 2005
Posts: 422
Location: India, Chennai
Followers: 1

Kudos [?]: 3 [0], given: 0

Re: DS: Inequality [#permalink] New post 09 Nov 2005, 22:39
C
Stmt1: Let K = 0 then -2 > 0 false.
Let K = -5 then 18> 0 true. So stmt 1 is insufficient.

Stmt2: Let k = 0 then -2>0 false
Let k = 5 then 28 > 0 true. So stmt 2 is insufficient.

Combing both -1<K<1. Let K = 0 -2 > 0 false. Let k = .5 then -1.25 > 0 false. Let k = -.5 then -2.25 > 0 false. Hence the combined statments are sufficient.
Senior Manager
Senior Manager
avatar
Joined: 02 Oct 2005
Posts: 305
Followers: 1

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

 [#permalink] New post 10 Nov 2005, 23:50
Thats correct guys, OA is C
  [#permalink] 10 Nov 2005, 23:50
    Similar topics Author Replies Last post
Similar
Topics:
If k <0> 0? (1). 1/k-1 > 0 (2). 1/k+1 >0 (1) alimad 1 28 Oct 2007, 09:50
If k <> 0, 1, or -1, is 1/k > 0? 1. 1/k-1 > 0 2. mercypoint 5 18 Oct 2007, 23:10
If 5 < k < 5, is k > 2 ? (1) (k 1)(k 5)(k 2) < 0 iamba 7 10 Jun 2007, 13:41
Is k + k 2 > 0 (1) k <1> -2 is this a yes or no andrehaui 8 29 Mar 2007, 09:32
Is k^2 + k - 2 > 0 1, k<1 2, k>-1 macca 6 22 Sep 2005, 03:54
Display posts from previous: Sort by

Is k + k - 2 > 0 (1) k < 1 (2) k > -1

  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®.