BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

M=N+2

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pm
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by Anurag@Gurome » Thu Sep 06, 2012 10:08 pm
grandh01 wrote:Given that m= n + 2, what is the value
of m^2+4m+4?

1) n=20
2) n^=400

OA IS D
m = n + 2
We want to find the value of m² + 4m + 4.

(1) n = 20 implies m = 20 + 2 = 22
So, we can find the value of m² + 4m + 4, as we know m; SUFFICIENT.

(2) n² = 400 implies n = 20, -20
If m = 22, so we can find the value of m² + 4m + 4, as we did in statement 1.
If m = -18, we get a different value of m² + 4m + 4
No definite answer; NOT sufficient.

The correct answer is A.
Last edited by Anurag@Gurome on Thu Sep 06, 2012 10:21 pm, edited 1 time in total.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
User avatar
Community Manager
Posts: 1060
Joined: Fri May 13, 2011 6:46 am
Location: Utrecht, The Netherlands
Thanked: 318 times
Followed by:52 members

by neelgandham » Thu Sep 06, 2012 10:12 pm
Thanks for the response Anurag, but can't n be -20 ?
Anil Gandham
Welcome to BEATtheGMAT | Photography | Getting Started | BTG Community rules | MBA Watch
Check out GMAT Prep Now's online course at https://www.gmatprepnow.com/
Top
Master | Next Rank: 500 Posts
Posts: 435
Joined: Wed Nov 16, 2011 7:27 am
Thanked: 48 times
Followed by:16 members

by alex.gellatly » Thu Sep 06, 2012 10:19 pm
Anurag@Gurome wrote:
grandh01 wrote:Given that m= n + 2, what is the value
of m^2+4m+4?

1) n=20
2) n^=400

OA IS D
m = n + 2
We want to find the value of m² + 4m + 4.

(1) n = 20 implies m = 20 + 2 = 22
So, we can find the value of m² + 4m + 4, as we know m; SUFFICIENT.

(2) n² = 400 implies n = 20
Again m = 22, so we can find the value of m² + 4m + 4, as we did in statement 1; SUFFICIENT.

The correct answer is D.
Hold on now.... can't n=-20? Thus changing the value of our equation. I got A for this reason. I was surprised with the answer D. Am I missing something?
A useful website I found that has every quant OG video explanation:

https://www.beatthegmat.com/useful-websi ... tml#475231
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pm
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by Anurag@Gurome » Thu Sep 06, 2012 10:22 pm
Yes, n can be 20 and -20, both. I've edited my reply. The answer should be A here.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Post new topic Post Reply
• Page 1 of 1