Question 1168768
Abbreviating showing very little of the work,

Synthetic division to check roots 4 and -2 will give zeros.

then x^2-6x+10 will have roots  {{{3+i}}} and {{{3-i}}}.


{{{h(x)=(x-4)(x+2)(x-(3+i))(x-(3-i))}}}, and you can do what you need to with this.