Obtain all zeros of 
if one of its zeros is -2.
We know that if 
is a zero of a polynomial then 
Since -2 is zero of 
Therefore 
is a factor of 
.
Now on dividing 
to find other zeros.
By applying division algorithm, we have:
= (
)(
)
= 
(
)
= 
{
}
Hence, the zeros of the given polynomial are: 
4