Chapter 3 - Polynomial and Rational Functions - Section 3.1 Polynomial Functions and Models - 3.1 Assess Your Understanding - Page 208: 45

$x^4-15x^2+10x +24$

Let us consider that $a$ is a zero of the function with multiplicity $b$. Then the factor of the function can be expressed as: $(x-a)^b$. We are given that the degree is $4$, and the zeros are $-4$, $-1$, $2$ and $3$. Therefore, we can write the equation of the function as: $f(x)=(x+4)(x+1)(x-2)(x-3) \\=x^4-15x^2+10x +24$