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**Mathamateur** Hey, I am running through some examples trying to get ready for my test and am completely stuck on one. I have a feeling something similar will be on our test too!

Anyways here is the question

Using the definition of the derivative find f ' (x). Then find f ' (-2), f ' (0), and f ' (3).

Problem: f(x) = -3 square root of x

Sorry, I can;t figure out how to make the square root sybol but you get the idea..-3 is on the outside with x inside the square root symbol. I mainly need to know f ' (x) and then obviously finding the others will be pretty easy. Thanks in advance!