Irreducible Polynomial/Examples/8 x^3 - 6 x - 1 in Rationals

Examples of Irreducible Polynomials
Consider the polynomial:
 * $\map P x = 8 x^3 - 6 x - 1$

over the ring of polynomials $\Q \sqbrk X$ over the rational numbers.

Then $\map P x$ is irreducible.