Finding Critical Points Using Derivatives

How to find critical points using derivatives.

[@estephanieperez4797]

thanks so much..would have never understood this on my own, your great!!!!!!!

[@gabrielgarcia4107]

I understand it better now. Thank you

[@bigtoe8765]

Wellllllll done. Thank you

[@zakariyayahya7350]

It is called max when it goes down first then down.