Given f(x)=x2f(x) = x^2f(x)=x2 and g(x)=x+2g(x) = x + 2g(x)=x+2, which expression represents (g∘f)(x)(g \circ f)(x)(g∘f)(x)?
x2+2x^2 + 2x2+2
(x+2)2(x + 2)^2(x+2)2
x2+4x^2 + 4x2+4
2x22x^22x2