If f(x)=x−4f(x) = x - 4f(x)=x−4 and g(x)=x+4g(x) = x + 4g(x)=x+4, what is f(g(x))f(g(x))f(g(x))?
xxx
x+8x + 8x+8
x−8x - 8x−8
888