Find all School-related info fast with the new School-Specific MBA Forum

It is currently 26 Dec 2014, 04:16

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

This is one of my first posts on the board and came up with

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 20 Nov 2005
Posts: 54
Location: Indianapolis, IN
Followers: 1

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

This is one of my first posts on the board and came up with [#permalink] New post 28 Nov 2005, 18:27
This is one of my first posts on the board and came up with this question while studying (albeit while trying to watch my COLTS play the Steelers in Monday night football!!)

Problem Solving question #55 in the OG 11th ed. is a minimizing question and the explanation in the OG doesn't explain it very well for me. Isn't there some rule for easily calculating the value of X that minimizes or maximizes a given formula or am I thinking of something else?

How do I go about handling these questions?

Thanks!
Director
Director
avatar
Joined: 14 Sep 2005
Posts: 994
Location: South Korea
Followers: 2

Kudos [?]: 39 [0], given: 0

Re: Minimizing or maximizing a formula? [#permalink] New post 28 Nov 2005, 18:31
stretchad wrote:
This is one of my first posts on the board and came up with this question while studying (albeit while trying to watch my COLTS play the Steelers in Monday night football!!)

Problem Solving question #55 in the OG 11th ed. is a minimizing question and the explanation in the OG doesn't explain it very well for me. Isn't there some rule for easily calculating the value of X that minimizes or maximizes a given formula or am I thinking of something else?

How do I go about handling these questions?

Thanks!


Please let me know what question it is.
_________________

Auge um Auge, Zahn um Zahn :twisted: !

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5081
Location: Singapore
Followers: 19

Kudos [?]: 167 [0], given: 0

 [#permalink] New post 28 Nov 2005, 18:50
Do post the question, as not everybody owns a copy of the 11th Ed. OG. This way, more people can answer your question.

Thanks !
Manager
Manager
avatar
Joined: 20 Nov 2005
Posts: 54
Location: Indianapolis, IN
Followers: 1

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

 [#permalink] New post 28 Nov 2005, 20:00
Sorry about that.

I think this one is a fairly simple one, but i feel like there must be an easy rule to remember as problems get increasingly difficult...

If y = 4 + (x - 3)^2, then y is lowest when x =
a - 14
b - 13
c - 0
d - 3
e - 4
SVP
SVP
User avatar
Joined: 24 Sep 2005
Posts: 1895
Followers: 11

Kudos [?]: 119 [0], given: 0

 [#permalink] New post 29 Nov 2005, 02:56
stretchad wrote:
Sorry about that.

I think this one is a fairly simple one, but i feel like there must be an easy rule to remember as problems get increasingly difficult...

If y = 4 + (x - 3)^2, then y is lowest when x =
a - 14
b - 13
c - 0
d - 3
e - 4


the rule is to spread the condensed expression into the form of a quadratic expression IN CASE it's originally in condensed form
For example: y=ax^2+bx+c . This is a parabola. The biggest/ smallest of y then is the peak/ nadir of the parabola. The formula for this point is :
-( b^2-4ac)/ (-4a) ( if i remember correctly, i'll double-check it)

1) if the expression contains -x^2, the question asks for the peak/ the biggest value.
2) if the expression contains x^2, the question asks for the nadir/ the smallest value.

For example: y=x^2 - 6x + 12
the nadir is -[((-6)^2- 4*12*1)/ 4*1] = 3 --> the smallest value of y is 3


OR you can solve it another way by trying to group the expression into froms of - (ax+b)^2 +c OR (ax+b)^2 +c
For example: x^2-6x+12= (x-3)^2+3
  [#permalink] 29 Nov 2005, 02:56
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic I came across a post (on another forum ) which raved about goalsnr 9 22 Nov 2010, 19:30
This is my first real post and one of the problems I had a rpfinley 7 05 Oct 2006, 17:02
One of the questions that came up on the exam the other day Charlie45 4 30 Mar 2006, 20:28
Question that came up on the test Charlie45 8 28 Mar 2006, 08:15
My first post...Comments please jumbojet 1 13 Nov 2005, 21:47
Display posts from previous: Sort by

This is one of my first posts on the board and came up with

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.