write a polynomial function

Question

How to express the following formula in a standard form of a polynomial function with zeros at 5, -4, and 1?

Answer 1

Let's use x for variables with the meaning of  x=5, x=-4, and x=1

Now, let's express it in formula:

(x-5)(x+4)(x-1)=0

(x²-5x+4x-20)(x-1)=0

(x²-x-20)(x-1)=0

x³-x²-20x-x²+x+20=0

x³-2x²-19x+20=0