Last visit was: 04 Jun 2024, 20:45 It is currently 04 Jun 2024, 20:45
Decision Tracker
My Rewards
Unanswered
Active Topics
New posts
New comers' posts
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

What's the value of x? 1). Root > 10 2). Root < 11

User avatar
vcbabu
Manager
Manager
Joined: 04 Sep 2006
Posts: 99
Own Kudos [?]: 333 [0]
Given Kudos: 0
Send PM
What's the value of x? 1). Root > 10 2). Root < 11 [#permalink] What's the value of x? 1). Root > 10 2). Root < 11   27 Jun 2009, 22:26
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Hide Show DIFFICULTY AND TIMER STATISTICS
What's the value of x?
1). Root [(x-5)(x + 4)] > 10
2). Root [(x-5)(x + 4)] < 11



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
superman
Senior Manager
Senior Manager
Joined: 18 Jun 2009
Posts: 284
Own Kudos [?]: 105 [0]
Given Kudos: 15
Location: San Francisco
Concentration: IT
Schools:Duke,Oxford,IMD,INSEAD
GPA: 3.79
Send PM
Re: What's the value of x? 1). Root > 10 2). Root < 11 [#permalink] What's the value of x? 1). Root > 10 2). Root < 11   29 Jun 2009, 14:52
IMHO - E

So solving the equations we get

100 < x^2-x-20 < 121

Not sufficient enuf

Whats the OA ?
User avatar
pshukla7
Intern
Intern
Joined: 24 May 2009
Posts: 4
Own Kudos [?]: [0]
Given Kudos: 0
Send PM
Re: What's the value of x? 1). Root > 10 2). Root < 11 [#permalink] What's the value of x? 1). Root > 10 2). Root < 11   29 Jun 2009, 17:36
100 < x^2-x-20 < 121

If x is real then it will be E but if x has to be integer then it will be C. value of X will be 12.

Gurus what think?
User avatar
superman
Senior Manager
Senior Manager
Joined: 18 Jun 2009
Posts: 284
Own Kudos [?]: 105 [0]
Given Kudos: 15
Location: San Francisco
Concentration: IT
Schools:Duke,Oxford,IMD,INSEAD
GPA: 3.79
Send PM
Re: What's the value of x? 1). Root > 10 2). Root < 11 [#permalink] What's the value of x? 1). Root > 10 2). Root < 11   29 Jun 2009, 18:44
Yes if X is integer then X will be 12 and it would be C
User avatar
mdfrahim
Manager
Manager
Joined: 28 Jan 2004
Posts: 94
Own Kudos [?]: 55 [0]
Given Kudos: 4
Location: India
Send PM
Re: What's the value of x? 1). Root > 10 2). Root < 11 [#permalink] What's the value of x? 1). Root > 10 2). Root < 11   29 Jun 2009, 18:56
how do you guys calculated the value of X to be 12 ?
User avatar
superman
Senior Manager
Senior Manager
Joined: 18 Jun 2009
Posts: 284
Own Kudos [?]: 105 [0]
Given Kudos: 15
Location: San Francisco
Concentration: IT
Schools:Duke,Oxford,IMD,INSEAD
GPA: 3.79
Send PM
Re: What's the value of x? 1). Root > 10 2). Root < 11 [#permalink] What's the value of x? 1). Root > 10 2). Root < 11   29 Jun 2009, 19:04
Since the boundary values are squares of 10 and 11 and the equation is just x-20 less than x^2, I started plugging in numbers from 10 onwards and only 12 satisfies.

Other easier way was in the original equation start pugging in values starting starting from 10.

100<(x-5)(x+4)<121

If there is a better or easier way please let us know..



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: What's the value of x? 1). Root > 10 2). Root < 11 [#permalink]
29 Jun 2009, 19:04
Moderators:
Bunuel
Math Expert
93463 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3131 posts
GMATBusters
GMAT Tutor
1898 posts