Discuss endpoints earlier

Changes made + a few more things. Is this what you had in mind?

ChristinaKoch (talk)06:45, 18 November 2013

I think we still need a comment that critical points can occur when the derivative is undefined. Not that this changes the solution much but students should still be aware.

CarmenBruni (talk)16:56, 19 November 2013

Picky!  ;) Changes made.

ChristinaKoch (talk)22:08, 19 November 2013