How to find maximum of cubic function

- How to find local maximum of cubic function
- How to find the maximum of a cubic function without calculus
- How to find the maximum and minimum value of a cubic function
- How to find maximum point of cubic function
- How to find maximum and minimum of cubic function
- How to find maximum value of a cubic function
- How to find minimum and maximum values of a cubic function
- How to find the local maximum and minimum of a cubic function