PS: Old question : PS Archive
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

It is currently 04 Dec 2016, 17:51
GMAT Club Tests

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.

Close

Request Expert Reply

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

PS: Old question

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 19 Jun 2003
Posts: 151
Followers: 1

Kudos [?]: 29 [0], given: 0

PS: Old question [#permalink]

Show Tags

New post 11 Jul 2004, 20:02
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

|B+6|–|B–5|=0

Could somebody explain the solution?

Thank you. :help2
CIO
CIO
User avatar
Joined: 09 Mar 2003
Posts: 463
Followers: 2

Kudos [?]: 56 [0], given: 0

 [#permalink]

Show Tags

New post 11 Jul 2004, 22:37
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
avatar
Joined: 08 Jun 2004
Posts: 245
Location: INDIA
Followers: 2

Kudos [?]: 9 [0], given: 0

 [#permalink]

Show Tags

New post 12 Jul 2004, 05:11
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
avatar
Joined: 16 May 2004
Posts: 65
Location: columbus
Followers: 1

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

ans [#permalink]

Show Tags

New post 15 Jul 2004, 15:53
|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
avatar
Joined: 21 Jun 2004
Posts: 52
Followers: 1

Kudos [?]: 1 [0], given: 0

 [#permalink]

Show Tags

New post 15 Jul 2004, 19:42
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, 19:42
Display posts from previous: Sort by

PS: Old question

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| 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®.