If (4 - x)/(5 + x) = x, what is the value of x^2 + 6x - 4?	Select.
A) -3
B) 0
C) 2
D) 4
E) 6
(4-x) = x*(5+x)   (4-x) = 5x+x^2   0 = x^2+6x-4   The answer is 0.
<result>B</result>
If (4 - x)/(5 + x) = x, what is the value of x^2 + 6x - 4?