If f(x)=x2f(x) = x^2f(x)=x2 and g(x)=2xg(x) = 2xg(x)=2x, which expression represents g(x)−f(x)g(x) - f(x)g(x)−f(x)?
2x22x^22x2
2x−x22x - x^22x−x2
x2−2xx^2 - 2xx2−2x
2x32x^32x3