Sorry for the bother but the book doesn't have an example for these questions, I understand how to do the questions further on and I think these use the same principle but these are really frustrating me and I can't figure them out. I can differentiate and find the co-ordinates of stationary points on a curve and decide whether they are maximum, miminum, or points of inflexion. Once again sorry for being annoying.
1. Find the least value of each of the following functions:
a) f(x) = x^2 - 12x + 8
(not sure how to type powers so I just put ^2)
If someone could just tell me the method, I can figure it out for the rest.