Please show all steps

Use the four-step process to find f'(x) and then find f'(4), f'(6), and f'(7). f(x) =121x+2 f' ( x ) = f' (4) = (Type an exact answer, using radicals as needed.) f' (6) = (Type an exact answer, using radicals as needed.) f' ( 7 ) = (Type an exact answer, using radicals as needed.)