A stupid question, but I'm wrong, pls explain me

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tracyyahoo: Master | Next Rank: 500 Posts; Posts: 147; Joined: Tue Jun 14, 2011 7:03 am; Thanked: 3 times

by tracyyahoo » Mon Sep 26, 2011 12:33 am

if ï½œx+4ï½œ=2, what is the value of m?

(1) m<0
(2) m^2+8m+12=0

I chose D because m could be either -2 or -6, that should answer the question

why is E? is it because m has two value is wrong??? Because m just only has these two values no others, don't you think both are suff.???

Pls explain me, thank you so much

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Source: Beat The GMAT — Data Sufficiency | Mon Sep 26, 2011 12:33 am

shankar.ashwin: Legendary Member; Posts: 966; Joined: Sat Jan 02, 2010 8:06 amFollowed by: 21 members; Thanked: 230 times

by shankar.ashwin » Mon Sep 26, 2011 12:57 am

In DS questions 2 answers is not acceptable, you need to find 1 unique solution.
Here you get 2 values m (or is it x?) can take. So its E (cannot be determined)

tracyyahoo wrote:if ï½œx+4ï½œ=2, what is the value of m?

(1) m<0
(2) m^2+8m+12=0

I chose D because m could be either -2 or -6, that should answer the question

why is E? is it because m has two value is wrong??? Because m just only has these two values no others, don't you think both are suff.???

Pls explain me, thank you so much

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Mon Sep 26, 2011 5:15 am

tracyyahoo wrote:if ï½œx+4ï½œ=2, what is the value of m?

(1) m<0
(2) m^2+8m+12=0

I chose D because m could be either -2 or -6, that should answer the question

why is E? is it because m has two value is wrong??? Because m just only has these two values no others, don't you think both are suff.???

Pls explain me, thank you so much

Absolutely, in DS questions, we need to be very careful that we are getting a unique answer. If we are getting more than 1 value, then it not sufficient, as in the present case. So, here the answer has to be E.

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