Let f(x)=-1-6x^2-x^3 and g(x)=-2-4x^2, then f(x)-g(x) equals___?
A. 1-2x^2-x^3
B. -1-2x^2+x^3
C. 1+2x^2-x^3
D. -1+2x^2+x^3
f(x) = -1 - 6x^2 - x^3
g(x) = -2 - 4x^2
f(x)-g(x) =
-1 - 6x^2 - x^3 - (-2 - 4x^2)
-1 - 6x^2 - x^3 + 2 + 4x^2
1 - 2x^2 - x^3
it's A. :)