Find a monic irreducible polynomial equivelent to $(x-x_1)(x-x_2)\Phi_m$

Question

Find a monic irreducible polynomial $f(x) = (x - x_1) ... (x - x_n)$， $|x_1| > 1$ and $x_1$ is real, |x_2| < 1 and $x_2$ is real, $|x_j| = 1$ for all $j > 2$. And First, prove $n > 3$ and it must be even. I can prove $n>3$ and $n$ is even using the resolvent of quartic equation with leading coefficient 1. It is easy to know that there is an $m$ making $(x-x_3)...(x-x_n)$ is equivalent to $\Phi_m$.