Write me some laws of polynomials

Write me some laws of polynomials

You are a junior high school? High school? University? Which level do you need? All levels have studied this aspect. Now we are still learning to approximate some complex functions with polynomials! In the formula (a + b) 2 = A2 + 2Ab + B2, we can generalize it from two aspects: one is to generalize it from the index; the other is to generalize it from the item number. We know that (a + b) 2 = A2 + 2Ab + B2