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

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

\(\frac{4-x}{2+x}=x\) --> \(4-x=x*(2+x)\) --> \(4-x=2x+x^2\) --> \(x^2+3x-4=0\). As you can see there is no need to solve for x to answer the question.

Re: If (4 - x)/(2 + x) = x, what is the value of x^2 + 3x -4 ? [#permalink]

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Re: If (4 - x)/(2 + x) = x, what is the value of x^2 + 3x -4 ? [#permalink]

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29 Aug 2015, 02:06

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