Such function has the root of , which is conjugate to 
over the field of rational numbers, and the root 1-i, conjugate to 1+i 
over the field of real numbers.


So, the full list of the roots consists of 5 numbers {0, , , 1+i, 1-i}.


Thus your polynomial is


    p(x) =  = 

         =  =  = .


You can transform it to any other equivalent form.