Question: Are the polynomials f(x) = 1la + 4x3 - 9x2 + 21 and g(x) = 2 + 2x2 - 8x + 6 irreducible over Q

Are the polynomials f(x) = 1la + 4x3 - 9x2 + 21
Are the polynomials f(x) = 1la + 4x3 - 9x2 + 21 and g(x) = 2 + 2x2 - 8x + 6 irreducible over Q x]? Explain

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