If one choose the first factor (which is the conjugated binomial of x-2) and add it to our polinomial we would have:
This means, for the first factor, 2 is a root of multiplicity 2.
The sentence specify that the polinomial has multiplicity of 1 for each root, therefore, we cannot use either the conjugated binomial or the square binomial of the roots.
Thus, the only factor which is not changing the multiplicity is: