Show that $x^5-x^2+1$ is irreducible in $\mathbb{Q}[x]$. Show that $x^5-x^2+1$ is irreducible in $\mathbb{Q}[x]$. 
I tried use the Eisenstein Criterion (with a change variable) but I have not succeeded.
Thanks for your help.

$f(1)=1$; $f(-1)=-1$; $f(2)=29$; $f(-3)=-251$; $f(4)=1009$; $f(6)=7741$; $f(10)=99901$.
The above seven examples of $f(x)=$prime or $1$, shows that $f$ is irreducible because if not $f(x)=g(x)h(x)$ and f(x) can not be prime seven times.Do you see why? If not, try it.
