Final answer:
The zeros of the polynomial function f(x) = x^3 + x^2 + 20x are 0, -5, -4.
Step-by-step explanation:
The zeros of a polynomial function are the values of x that make the function equal to zero.
We are given that one zero of the polynomial function f(x) = x^3 + x^2 + 20x is x = 0.
To find the other zeros, we can use polynomial long division or synthetic division to factor out x = 0 and find the remaining quadratic equation.
Factoring the quadratic equation, we find that the zeros are x = -5 and x = -4.
Therefore, the correct answer is 0, -5, -4.