This is exactly the problem. It looks plausible. Every sentence makes sense. But they don't add up.
Quote:
> The polynomial given is f(x) = x^5 + x + 1. Since the polynomial has no rational roots (by the Rational Root Theorem) and it is a polynomial with integer coefficients, it is irreducible over the rationals
The polynomial has no rational roots - true.
But it's not irreducible. Irreducibility doesn't follow from the absence of rational roots. Here's the factorization:
> The polynomial given is f(x) = x^5 + x + 1. Since the polynomial has no rational roots (by the Rational Root Theorem) and it is a polynomial with integer coefficients, it is irreducible over the rationals
The polynomial has no rational roots - true. But it's not irreducible. Irreducibility doesn't follow from the absence of rational roots. Here's the factorization:
x^5 + x + 1 = (x^2 + x + 1)*(x^3 - x^2 + 1).