By applying Rolle's theorem, check whether it is possible that the function f(x) = x+x-12 has two real roots. Final answer: (input possible or impossible) (Answer this part last after you have throught through the reasons below.) Your reason is that if f(x) has two real roots then by Rolle's theorem: f'(x) must be (input a number here) at a certain value of x between these two roots, but f'(x) is always (input negative, positive, or zero