If is a zero of the polynomial function, then is a factor of for the polynomial function.

The zeros of the polynomial function are , , , , and .

Since is a zero of the polynomial function, is a factor of the polynomial function.

Since is a zero of the polynomial function, is a factor of the polynomial function.

Since is a zero of the polynomial function, is a factor of the polynomial function.

Since is a zero of the polynomial function, is a factor of the polynomial function.

Since is a zero of the polynomial function, is a factor of the polynomial function.

Thus, the polynomial function is .

The polynomial function is  .