Use the four-step process to find f'(x) and then find f'(2), f'(4), and f'(5). f(x) = 181x+9 f' ( x ) = f'(2) = (Type an exact answer, using radicals as needed.) f' (4) = (Type an exact answer, using radicals as needed.) f' (5) = (Type an exact answer, using radicals as needed.)