GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Aug 2018, 19:14

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.

Close

Request Expert Reply

Confirm Cancel

If x^2 + 2x − 24 = 24, which of the following is a potential value of

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 48067
If x^2 + 2x − 24 = 24, which of the following is a potential value of  [#permalink]

Show Tags

New post 13 May 2018, 21:24
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

81% (00:30) correct 19% (00:47) wrong based on 57 sessions

HideShow timer Statistics

Intern
Intern
avatar
B
Joined: 05 Jan 2014
Posts: 46
GMAT 1: 610 Q47 V26
WE: Information Technology (Computer Software)
GMAT ToolKit User CAT Tests
Re: If x^2 + 2x − 24 = 24, which of the following is a potential value of  [#permalink]

Show Tags

New post 13 May 2018, 21:36
Solving the quadratic equation:
x^2 + 2x − 48 = 0
x^2 + 8x - 6x - 48 = 0
x*(x+8) -6*(x + 8) = 0
x = -8 or 6
Hence, Answer is D
Manager
Manager
avatar
B
Joined: 30 Jul 2014
Posts: 151
GPA: 3.72
Reviews Badge
Re: If x^2 + 2x − 24 = 24, which of the following is a potential value of  [#permalink]

Show Tags

New post 14 May 2018, 08:04
Quadratic equation = answer = D
_________________

A lot needs to be learned from all of you.

Manager
Manager
avatar
G
Joined: 01 Aug 2017
Posts: 187
Location: India
Concentration: General Management, Leadership
Schools: ISB '20 (S), IIMA (S)
GMAT 1: 500 Q47 V15
GPA: 3.4
WE: Information Technology (Computer Software)
Premium Member Reviews Badge CAT Tests
Re: If x^2 + 2x − 24 = 24, which of the following is a potential value of  [#permalink]

Show Tags

New post 14 May 2018, 08:14
Bunuel wrote:
If x^2 + 2x − 24 = 24, which of the following is a potential value of x?

A. -6
B. 0
C. 4
D. 6
E. 8


I have tried an easier way to solve this question.

\(x^2 + 2x − 24 = 24\)

\(x^2 + 2x = 24 + 24\)

x (x+2) = 48.

Substitute each option.
Clearly 6 (6+2) = 48. x =6

Ans - D

Please let me know if I am missing anything.
_________________

If it helps you please press Kudos!

Thank You
Sudhanshu

Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 3798
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User Premium Member
Re: If x^2 + 2x − 24 = 24, which of the following is a potential value of  [#permalink]

Show Tags

New post 14 May 2018, 08:46
Bunuel wrote:
If x^2 + 2x − 24 = 24, which of the following is a potential value of x?

A. -6
B. 0
C. 4
D. 6
E. 8

\(x^2 + 2x - 48 = 0\)

Or, \(x^2 + x(8 - 6) - 48 = 0\)

Or, \(x^2 + x - 6x - 48 = 0\)

Or, \(x(x + 8) - 6(x + 8)= 0\)

Or, \((x - 6)(x + 8) = 0\)

Or, x = 6 and x = -8, Thus Answer must be (D)
_________________

Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )

Target Test Prep Representative
User avatar
G
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2781
Re: If x^2 + 2x − 24 = 24, which of the following is a potential value of  [#permalink]

Show Tags

New post 14 Jul 2018, 19:13
Bunuel wrote:
If x^2 + 2x − 24 = 24, which of the following is a potential value of x?

A. -6
B. 0
C. 4
D. 6
E. 8


Simplifying the equation, we have:

x^2 + 2x - 48 = 0

(x + 8)(x - 6) = 0

x = -8 or 6

Answer: D
_________________

Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Re: If x^2 + 2x − 24 = 24, which of the following is a potential value of &nbs [#permalink] 14 Jul 2018, 19:13
Display posts from previous: Sort by

If x^2 + 2x − 24 = 24, which of the following is a potential value of

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  

Events & Promotions

PREV
NEXT


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.