Register    Login    Search    Rss Feeds

Forums Home » Ask An Instructor » GMAT Math » Manhattan GMAT Math Strategy Guides


 Page 1 of 1 [ 2 posts ] 



  Print view Print view Previous topic Previous topic | Next topic Next topic
 

Is |x|<1?

Author Message
apoorva_srivastva
 Post subject: Is |x|<1?
 Post Posted: Thu May 21, 2009 2:22 am 
Offline
Students


Posts: 27
Is |x|<1?

1.) |x+1| = 2 |x-1|
2.) |x-3| not equal to 3

--------------------------------------------------------------------------------

I would like to know that if there is mod sign on both the sides of the linear equation ....can we get rid of the mod and slove the equation as a normal linear equation as in statement 1

|x + 1| = 2|x - 1|

so by my logic can we get rid of the mod sign

(x+1) = 2(x-1)

and slove further.....

ALSO PLEASE SUGGEST ME ANY PREP MATERIAL FOR MODULUS AND INEQUALITIES
Top 
StaceyKoprince
 Post subject: Re: Is |x|<1?
 Post Posted: Thu May 28, 2009 2:05 pm 
Offline
ManhattanGMAT Staff


Posts: 6077
Location: San Francisco
The equation you offer is one possibility, but it is not the only possibility - the absolute value sign introduces multiple possible equations that all have to be checked (since this is a DS question).

You can find more material on general absolute values in the Number Properties book and on absolute value equations in the Equations, Inequalities and VICs book.

_________________
Stacey Koprince
Instructor
Director of Online Community
ManhattanGMAT
Top 
Display posts from previous:  Sort by  
 
 Page 1 of 1 [ 2 posts ] 





Who is online

Users browsing this forum: No registered users and 0 guests

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: