Need help or more examples, check out the link below.
http://www.youtube.com/watch?v=OjnOgoEu6CM
Good video on differentials and linear approximations:
https://www.youtube.com/watch?v=CMeJYSvXKxc
HW: Complete 1 - 14 on WS Derivative of exponential functions and WS Differentials 1 - 5 should be done.