Register    Login    Search    Rss Feeds

Forums Home » Ask An Instructor » GMAT Math » GMAT Prep Math


 Page 1 of 1 [ 3 posts ] 



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

1001^2-999^2 / 101^2- 99^2

Author Message
marini.walker
 Post subject: 1001^2-999^2 / 101^2- 99^2
 Post Posted: Tue Apr 27, 2010 2:16 pm 
Offline
Course Students


Posts: 3
I got this in a practice exam sorry don't know how upload it to here.

I thought the answear was ten but I don't know how to prove it.

Whats the way to break this down:

(1001^2-999^2)/ (101^2- 99^2)

Marini
Top 
parthatayi
 Post subject: Re: 1001^2-999^2 / 101^2- 99^2
 Post Posted: Wed Apr 28, 2010 4:25 am 
Offline
Course Students


Posts: 40
please use a^2-b^2=(a+b)(a-b)

(1001+999)(1001-999)/(101+99)(101-99)=10
Top 
Ben Ku
 Post subject: Re: 1001^2-999^2 / 101^2- 99^2
 Post Posted: Sat May 01, 2010 2:33 am 
Offline
ManhattanGMAT Staff


Posts: 824
parthatayi provides an excellent solution.

_________________
Ben Ku
Instructor
ManhattanGMAT
Top 
Display posts from previous:  Sort by  
 
 Page 1 of 1 [ 3 posts ] 





Who is online

Users browsing this forum: No registered users and 1 guest

 
 

 
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: