If (4 - x)/(4 + x) = x, what is the value of x^2 + 5x - 4?  Select the correct option
A) 0
B) 2
C) 4
D) 6
E) 8
(4-x) = x*(4+x)   (4-x) = 4x+x^2   0 = x^2+5x-4   The answer is 0.
<result>A</result>
If (4 - x)/(4 + x) = x, what is the value of x^2 + 5x - 4?