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

It is currently 18 May 2013, 13:58
Customize  |  Hide

Search
Register
New posts
Unanswered

math problem

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Intern
Intern
Joined: 07 Sep 2008
Posts: 25
Followers: 0

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

math problem [#permalink] New post 13 Sep 2008, 02:50
(x^2 + 6x +9) + 6(x+3) + 9 = 0, then x= ??

The answer is -6. Can you please advise how you get to this answer?
Many thanks,
Andreas
Intern
Intern
Joined: 11 Sep 2008
Posts: 16
Followers: 0

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

Re: math problem [#permalink] New post 13 Sep 2008, 08:01
factoring gives you (x+6)(x+6)=0 [check: x^2+6x+6x+36 = x^2+12x+36].
so (x+6)(x+6), mean the ansewr is -6 or -6....i.e. -6.
substitute in the original form to get check (you will get 0=0)
Intern
Intern
Joined: 07 Sep 2008
Posts: 25
Followers: 0

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

Re: math problem [#permalink] New post 13 Sep 2008, 15:02
thats great ! Thank you !
Manager
Manager
Joined: 28 Aug 2008
Posts: 102
Followers: 1

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

Re: math problem [#permalink] New post 13 Sep 2008, 19:35
Yeah... just multiply out 6(x+3) and sum:

x^2 + 6x + 9 + 6x + 18 + 9 = 0

x^2 + 12x + 36 = 0

( x+6)(x+6) = 0

-6 is answer
Intern
Intern
Joined: 03 Sep 2008
Posts: 22
Followers: 0

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

Re: math problem [#permalink] New post 14 Sep 2008, 10:29
Here's a slightly different approach.

You recognize that original equation has the form a^2+2ab+b^2=(a+b)^2
with a=(x+3) and b = 3.

Therefore the original equation can be written as

(x+3+3)^2=0 ===> x = - 6
Re: math problem   [#permalink] 14 Sep 2008, 10:29
    Similar topics Author Replies Last post
Similar
Topics:
 New posts Math problems just4u1530 7 09 Oct 2007, 09:42
New posts 2 math problem hardaway7 9 08 Feb 2009, 22:22
New posts 1 math problem Jazzy12 1 22 Jul 2010, 15:39
Moved topic 9 EXPERTS_POSTS_IN_THIS_TOPIC In the addition table shown above, what is the value of m+n mattapraveen 21 03 Nov 2010, 21:27
New posts A math problem tracyyahoo 3 24 Jul 2011, 03:59
Display posts from previous: Sort by

math problem

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma

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