Okay, here we have this:
We need to find the zeros and it's multiplicity of the following polynomial:

So, considering that in a function of the following form:

The zeros will be: x₀, x₁, ..., xn
The multiplicities are:

In this case we obtain that the zeros with their respectives multiplicities are:
Zeros of multiplicity one: 0, 4, -3
Zeros of multiplicity two: -9