simple equation

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LSB: Master | Next Rank: 500 Posts; Posts: 229; Joined: Thu Nov 08, 2007 3:47 pm; Thanked: 14 times; GMAT Score:750

by LSB » Thu Aug 21, 2008 12:20 pm

If (4-X)/(2+X) = X, then what is the value of X^2+3X-4

A -4
B -1
C 0
D 1
E 2

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Source: Beat The GMAT — Problem Solving | Thu Aug 21, 2008 12:20 pm

parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members; Thanked: 146 times

by parallel_chase » Thu Aug 21, 2008 12:23 pm

(4-x)/(2+x)= x

4-x = 2x + x^2

4 = 3x + x^2

x^2 + 3x - 4 = 0

Hence the answer is C.

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LSB: Master | Next Rank: 500 Posts; Posts: 229; Joined: Thu Nov 08, 2007 3:47 pm; Thanked: 14 times; GMAT Score:750

by LSB » Thu Aug 21, 2008 1:14 pm

Good job

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