Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 21 May 2013, 17:55
Customize  |  Hide

Search
Register
New posts
Unanswered

PS: Old question

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Manager
Manager
Joined: 19 Jun 2003
Posts: 165
Followers: 1

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

GMAT Tests User
PS: Old question [#permalink] New post 11 Jul 2004, 21:02
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
|B+6|–|B–5|=0

Could somebody explain the solution?

Thank you. :help2
CIO
CIO
User avatar
Joined: 09 Mar 2003
Posts: 471
Followers: 1

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

GMAT Tests User
 [#permalink] New post 11 Jul 2004, 23:37
any algebraic equation with absolute value must be rewritten in its positive and negative form without the absolute value.

For example,
|x| = 6 so
x = 6 and x = -6

|x-3| = 5 becomes
x-3 = 5 and x-3 = -5 so
x=8 and x=-2, and both work when you plug them back in.

Same thing here.
Start with |b+6|-|b-5|=0, and make it
|b+6|=|b-5|

So b+6 = b-5 or b+6 = -(b-5)
Solve each one, and see that in the first one, b cancels and it's impossible, and in the second one, b=-.5
Manager
Manager
Joined: 08 Jun 2004
Posts: 245
Location: INDIA
Followers: 2

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

GMAT Tests User
 [#permalink] New post 12 Jul 2004, 06:11
let us try one another way

sqauring BOTH the absolute values...


we have... B^2+12B +36 = B^2-10B +25

22 b = -(11)
b = -.5

hope that helps!

have fun :)
_________________

the whole worldmakes way for the man who knows wer he's going... good luck

Manager
Manager
Joined: 16 May 2004
Posts: 65
Location: columbus
Followers: 1

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

ans [#permalink] New post 15 Jul 2004, 16:53
|B+6|–|B–5|=0

I think mod problems should be tackled taking into consideration the ranges in which the exp are valid

B+6 > 0 if B > -6

B- 5 > 0 if B > 5

so there are 3 regions for which we have to consider the expression
B> 5 and -6 > B > 5 andB < -6

for B > 5 and D < -6 the equation has no soln
for the 2nd range B + 6 -(-(B - 5)) = 0
= B + 6 + B -5 = 0
2B = -1
or B= -.5
Manager
Manager
Joined: 21 Jun 2004
Posts: 59
Followers: 1

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

 [#permalink] New post 15 Jul 2004, 20:42
ian7777 wrote:
any algebraic equation with absolute value must be rewritten in its positive and negative form without the absolute value.

For example,
|x| = 6 so
x = 6 and x = -6

|x-3| = 5 becomes
x-3 = 5 and x-3 = -5 so
x=8 and x=-2, and both work when you plug them back in.

Same thing here.
Start with |b+6|-|b-5|=0, and make it
|b+6|=|b-5|

So b+6 = b-5 or b+6 = -(b-5)
Solve each one, and see that in the first one, b cancels and it's impossible, and in the second one, b=-.5


Taking time in to consideration, this will be the quickest method to solve the problem
  [#permalink] 15 Jul 2004, 20:42
    Similar topics Author Replies Last post
Similar
Topics:
 New posts old question crackgmat750 3 03 Jul 2004, 23:32
New posts SC - old question crackgmat04 5 17 Nov 2004, 05:45
New posts ps OLD jeeboombaa 3 19 Dec 2005, 17:58
New posts PS from old exam (2) kaleoncheng 6 10 Oct 2007, 15:26
New posts Old Maths Questions vivektripathi 3 19 Sep 2008, 11:17
Display posts from previous: Sort by

PS: Old question

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma, IanStewart

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com