Question

Someone mind telling me if I did this right ?
Suppose that the functions f and g are defined for all real numbers x as follows.

f(x)=2x^2
g(x)=x+4
Write the expressions for (g-f)(x) and (g.f)(x) and evaluate (g+f)(2)

My work
(g-f)(x)= (x+4)-2x^2
(g.f)(x)=(x+4).2x^2

evaluate (g+f)(2)=4x^2+6