What is the value of x? : GMAT Data Sufficiency (DS)
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 10 Dec 2016, 15:49

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# What is the value of x?

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Director
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 547
Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)
Followers: 3

Kudos [?]: 60 [0], given: 562

What is the value of x? [#permalink]

### Show Tags

02 Nov 2012, 20:14
00:00

Difficulty:

35% (medium)

Question Stats:

65% (01:47) correct 35% (00:52) wrong based on 80 sessions

### HideShow timer Statistics

What is the value of x?

(1) x^2 + 5x + 6 = 0
(2) x^2 - 10x -24=0
[Reveal] Spoiler: OA

_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : http://gmatclub.com/forum/end-of-my-gmat-journey-149328.html#p1197992

Last edited by Bunuel on 02 Nov 2012, 22:29, edited 1 time in total.
Renamed the topic and edited the question.
Senior Manager
Joined: 15 Jun 2010
Posts: 368
Schools: IE'14, ISB'14, Kellogg'15
WE 1: 7 Yrs in Automobile (Commercial Vehicle industry)
Followers: 11

Kudos [?]: 366 [1] , given: 50

Re: beat this: contradicting statements [#permalink]

### Show Tags

02 Nov 2012, 21:01
1
This post received
KUDOS
Sachin9 wrote:
What is the value of x?

1)x^2 + 5x + 6 = 0
2)x^2 - 10x -24=0

St 1: insufficient: x^2+5x+6 => x^2+3x+2x+6 => x(x+3) + 2(x+3) => (x+2) (x+3)
So x = -2 or -3
St 2: insufficient: x^2-10x-24 => x^2 -12x+2x-24 => x(x-12) + 2(x-12) => (x+2) (x-12)
So x= -2 or 12

1)+2) x=-2

Hence C.
_________________

Regards
SD
-----------------------------
Press Kudos if you like my post.
Debrief 610-540-580-710(Long Journey): http://gmatclub.com/forum/from-600-540-580-710-finally-achieved-in-4th-attempt-142456.html

Moderator
Joined: 02 Jul 2012
Posts: 1231
Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42
GPA: 3.8
WE: Engineering (Energy and Utilities)
Followers: 115

Kudos [?]: 1363 [1] , given: 116

Re: beat this: contradicting statements [#permalink]

### Show Tags

02 Nov 2012, 22:04
1
This post received
KUDOS
Sachin9 wrote:
What is the value of x?

1)x^2 + 5x + 6 = 0
2)x^2 - 10x -24=0

1) x = -2 or x = -3. Insufficient.
2) x = -2 or x = 12. Insufficient.

1 & 2 together. x = -2. Sufficient.

The statements never contradict each other. For these statements to contradict each other, statement 2 should not have neither -2 nor -3 as a root. For the statements to be insufficient together, both statements should have more than one common root.

Kudos Please... If my post helped.
_________________

Did you find this post helpful?... Please let me know through the Kudos button.

Thanks To The Almighty - My GMAT Debrief

GMAT Reading Comprehension: 7 Most Common Passage Types

Director
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 547
Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)
Followers: 3

Kudos [?]: 60 [0], given: 562

Re: beat this: contradicting statements [#permalink]

### Show Tags

02 Nov 2012, 22:10
yeh Macfauz.

If we incorrectly solve 2nd equation by factoring (x-4)(x-6) , then the 2 statements would contradict..

So I guess, if we find that the statements are contradicting , then we can be sure that we have made a mistake somewhere ..
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : http://gmatclub.com/forum/end-of-my-gmat-journey-149328.html#p1197992

VP
Status: Been a long time guys...
Joined: 03 Feb 2011
Posts: 1420
Location: United States (NY)
Concentration: Finance, Marketing
GPA: 3.75
Followers: 174

Kudos [?]: 1303 [0], given: 62

Re: beat this: contradicting statements [#permalink]

### Show Tags

02 Nov 2012, 22:27
Sachin9 wrote:
yeh Macfauz.

If we incorrectly solve 2nd equation by factoring (x-4)(x-6) , then the 2 statements would contradict..

Why would we be solving the equation incorrectly?
_________________
Director
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 547
Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)
Followers: 3

Kudos [?]: 60 [0], given: 562

Re: beat this: contradicting statements [#permalink]

### Show Tags

02 Nov 2012, 22:30
Marcab wrote:
Sachin9 wrote:
yeh Macfauz.

If we incorrectly solve 2nd equation by factoring (x-4)(x-6) , then the 2 statements would contradict..

Why would we be solving the equation incorrectly?

in case you ever do, in the heat of the pressure . then this knowledge will help you know you have gone wrong :D
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : http://gmatclub.com/forum/end-of-my-gmat-journey-149328.html#p1197992

Senior Manager
Joined: 15 Jun 2010
Posts: 368
Schools: IE'14, ISB'14, Kellogg'15
WE 1: 7 Yrs in Automobile (Commercial Vehicle industry)
Followers: 11

Kudos [?]: 366 [1] , given: 50

Re: beat this: contradicting statements [#permalink]

### Show Tags

03 Nov 2012, 04:20
1
This post received
KUDOS
Sachin9 wrote:
Marcab wrote:
Sachin9 wrote:
yeh Macfauz.

If we incorrectly solve 2nd equation by factoring (x-4)(x-6) , then the 2 statements would contradict..

Why would we be solving the equation incorrectly?

in case you ever do, in the heat of the pressure . then this knowledge will help you know you have gone wrong :D

You can not do the factorization incorrectly if you know the concept. The -ve sign before 24 indicates you to choose two factors of 24 and subtract it from each other to make 10. So only (12,2) this pair will satisfy.

As per your factorization (x-4)(x-6) the equation becomes x^2-10x+24(which is not in the question).

So the + or - sign before the last constant term will give u clue whether u need to add or subtract.
_________________

Regards
SD
-----------------------------
Press Kudos if you like my post.
Debrief 610-540-580-710(Long Journey): http://gmatclub.com/forum/from-600-540-580-710-finally-achieved-in-4th-attempt-142456.html

Director
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 547
Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)
Followers: 3

Kudos [?]: 60 [0], given: 562

Re: What is the value of x? [#permalink]

### Show Tags

03 Nov 2012, 06:28
agreed mate.. i said if you do commit mistake in the heat of the pressure...
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : http://gmatclub.com/forum/end-of-my-gmat-journey-149328.html#p1197992

Re: What is the value of x?   [#permalink] 03 Nov 2012, 06:28
Similar topics Replies Last post
Similar
Topics:
5 What is the value of integer x? 3 27 Jun 2011, 20:31
1 What is the value of x? 4 05 Mar 2011, 05:00
32 What is the value of x? 12 04 Nov 2010, 17:22
29 What is the value of integer x ? 11 20 Apr 2010, 06:04
6 What is the value of x? 9 19 Nov 2007, 15:30
Display posts from previous: Sort by

# What is the value of x?

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.