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

It is currently 21 Oct 2014, 16:14

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

(x + 7) is a factor in x^2 - mx - 56. What is the value of m

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Current Student
avatar
Status: Final Lap Up!!!
Affiliations: NYK Line
Joined: 21 Sep 2012
Posts: 1097
Location: India
GMAT 1: 410 Q35 V11
GMAT 2: 530 Q44 V20
GMAT 3: 630 Q45 V31
GPA: 3.84
WE: Engineering (Transportation)
Followers: 31

Kudos [?]: 273 [0], given: 67

(x + 7) is a factor in x^2 - mx - 56. What is the value of m [#permalink] New post 05 Dec 2012, 07:00
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

75% (01:53) correct 25% (00:42) wrong based on 56 sessions
(x + 7) is a factor in x^2 - mx - 56. What is the value of m?

A. 1
B. 8
C. 14
D. 15
E. 16
[Reveal] Spoiler: OA

Last edited by Bunuel on 05 Dec 2012, 07:03, edited 1 time in total.
Edited the question.
Expert Post
Verbal Forum Moderator
Verbal Forum Moderator
User avatar
Status: Preparing for the another shot...!
Joined: 03 Feb 2011
Posts: 1425
Location: India
Concentration: Finance, Marketing
GPA: 3.75
Followers: 129

Kudos [?]: 644 [0], given: 62

GMAT ToolKit User Premium Member
Re: (x + 7) is a factor in x^2 - mx - 56. What is the value of m [#permalink] New post 05 Dec 2012, 10:01
Expert's post
Given the fact that (x+7) is the factor of the equation,
so it claerly means that one value of x=-7; the other we don't know and we don't have to.

The equation can be written in factor form as:
(x+7)*(x+a) where a is the other value of x.

On putting the value of x=-7 in the equation,
x^2-mx-56=0

we get:

49+7m-56=0

-7=-7m
m=1

+1 A.
_________________

Prepositional Phrases Clarified|Elimination of BEING| Absolute Phrases Clarified
Rules For Posting
www.Univ-Scholarships.com

Current Student
avatar
Status: Final Lap Up!!!
Affiliations: NYK Line
Joined: 21 Sep 2012
Posts: 1097
Location: India
GMAT 1: 410 Q35 V11
GMAT 2: 530 Q44 V20
GMAT 3: 630 Q45 V31
GPA: 3.84
WE: Engineering (Transportation)
Followers: 31

Kudos [?]: 273 [0], given: 67

Re: (x + 7) is a factor in x^2 - mx - 56. What is the value of m [#permalink] New post 05 Dec 2012, 23:20
thanks marcab just wanted to be sure of my approach
Re: (x + 7) is a factor in x^2 - mx - 56. What is the value of m   [#permalink] 05 Dec 2012, 23:20
    Similar topics Author Replies Last post
Similar
Topics:
4 Experts publish their posts in the topic What is the value of 2x^2 - 2.4x - 1.7 for x = 0.7 ? Bunuel 5 03 Mar 2014, 00:16
Experts publish their posts in the topic What is the value of [m]x^2 + y^2[/m] ? metallicafan 1 26 Aug 2012, 08:56
If x=7, what is the value of 1-x^2+x^3-x^4+x^5-x^6 joemama142000 10 28 Apr 2006, 02:08
What is the value of x^2 + 2xy + y^2? 1) x + y = 7 2) x = 2 john2005 6 18 Apr 2006, 18:13
What is the value of x^3 - 2x^2 + 7? (1) 3x^3- x = 2 (2) Marina 6 18 Mar 2005, 17:33
Display posts from previous: Sort by

(x + 7) is a factor in x^2 - mx - 56. What is the value of m

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.