the value of ^(âˆ’7)^

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Wed Feb 29, 2012 12:17 am

What is the value of ^(âˆ’7)^, given that ^m^ = m^3 âˆ’ m^2 âˆ’ m?
A. âˆ’399
B. âˆ’385
C. âˆ’301
D. âˆ’287
E. 301

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Source: Beat The GMAT — Problem Solving | Wed Feb 29, 2012 12:17 am

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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 » Wed Feb 29, 2012 12:28 am

sanju09 wrote:What is the value of ^(âˆ’7)^, given that ^m^ = m^3 âˆ’ m^2 âˆ’ m?
A. âˆ’399
B. âˆ’385
C. âˆ’301
D. âˆ’287
E. 301

^m^ = m^3 âˆ’ m^2 âˆ’ m
^(âˆ’7)^ = (-7)^3 - (-7)Â² - (-7)
= -343 - 49 + 7
= -385

The correct answer is B.

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