Hi there,

I have to answer to following question, and am having issues:

Given that is a root of the polynomial equation

,

find all other roots.

I can see that is a root, and that because of conjugate pairs, must be, and I understand that there must be 6 roots due to the degree of the polynomial, but I don't know how to find the other 3. Any advice or pointers would be hugely appreciated!

Thanks in advance!