I'm looking for help to determine what I should do with my graphing calculator to satisfy the following criteria:

Use a graphing calculator to find f'(2), f'(16), and f'(-3) for the following [functions] when the derivative exists.

The problem I'm currently working on has the functionf(x) = 6xI am not looking for the answer, but I do want to know how I can determine whether or not the functions' derivative exists, and what I need to do on the graphing calculator.^{2}-4x

I do not have any work to support this, because I have no idea where to start.

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