Finding derivatives as x approaches

[rberg1897]

The question I'm having problems with is

If

, find

, using the definition of derivative.

is the limit as

________ of the expression __________________. The value of this limit is _________________. I've got the first part that f'(4) is the limit as x--> 4, but I'm not sure what expression the second part is asking for. I can't find any examples and it's an online program, so I'm not sure if I got the answer and just didn't enter it correctly or I'm completely off. I'm pretty sure I can get the rest of the problem. Just need some help with the second part.

 

[HallsofIvy]

The derivative of function f, at x= 4, is given by \(\displaystyle \lim_{x\to 4} \frac{f(x)- f(4)}{x- 4}\).

 

[rberg1897]

Yeah, that's exactly how it's worded, and that's the answer I have so thank you for letting me know I'm not crazy. I must just be having problems entering it into the webwork problem. Thank you again for your help.