How to solve:
Problem: If f(x) = 3x2, find f'(4).
If f(x) = xn, then f '(x) = n·xn - 1.
Use this to find the derivative, f '(x).:		 f(x) = 3x2
f'(x) = 2·3x1 = 6x.
Substitute 4 for x to find f '(4): f'(4) = 6·4 = 24.
Here's one to try:

      





picture here picture here picture here
picture here picture here picture here
picture here picture here picture here


(Starts timer)
     




              





   picture here

Copyright © 2007