Use limits to compute the derivative

Question

Use limits to compute the derivative 

 

f'(5) f(x)=7x³

Answer 1

Follow your previous example (question), f(x)=5x³. You can do exactly as in that example. If you can't do, that  would mean that you still didn't understand. It doesn't help you if someone else solves it for you.

This is very basic question that you should be taught. When you try and have difficulties someone can help.