Just liked to say thank you, great help.

Thanks a lot, you really explained well

Mr. Kennedy, I would recommend that you clearly explain that it is continuous on a CLOSED interval [a,b] and that it is differentiable on an OPEN interval (a,b). You cannot differentiate at a closed interval in the Rolle's Thm or MVT.

Thanks a lot sir

In my calculator I didn't get 12 for the top fraction on mean value theorm