Static method performance vs non static

Hello everybody! I've created a Polynome class which holds some methods in it, like the one calculating the answer for a given x.

Some MonoBehaviour scripts in my game instatiate that Polynome class, and calculate the polynomial equation every frame with a changing variable to make nice movements. The question is: Should I make the Calculate Method Static? I didn't do so for now because the method have full access on the class data, but I could easily pass it using parameters of the Static Method. Do we get more performance using a Static method? If I have 80 gameObjects with polynomes, do it means that I have 80 copy of that Calculate same Method?