$\"\"$

$\"\"$ are factors of the polynomial function.

The polynomial function as a product.

$\"\"$

$\"\"$ (Product of two same signs is positive)

Apply formula: $\"\"$ .

$\"\"$ (Using FOIL method)

$\"\"$

$\"\"$ . $\"\"$

$\"\"$ is a polynomial function of least degree with integral coefficients and zeros of $\"\"$ .