Write a polynomial function p (x) with x-intercepts at - 1,4, and - 5

x^3 + 2x^2 - 19x - 20

Step-by-step explanation:

Just use factored form to make them zeros, therefore making them x intercepts.

-1 - -> x + 1

4 - -> x - 4

-5 - -> x + 5

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

Now multiply this out with a Punnett square.

After that, the result is ...

x^3 + 2x^2 - 19x - 20