Suppose that the functions f and g are defined for all real numbers x as follows.f(x)=x+4,g(x)=3x+2.Write the expressions for(f*g)(x) and (f-g)(x) and evaluate (f+g)(4)

Answer 1

these are just simple polynomial addition, subtraction and multiplication.

(f*g)(x) = f(x)*g(x) = (x+4)(3x+2)
and the same for the other operators.