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Are the following polynomials irreducible over Q? Prove why or why not. (a) 2x^13−25x^3+ 10x−30 (b)...

Are the following polynomials irreducible over Q? Prove why or why not.

(a) 2x^13−25x^3+ 10x−30

(b) 5x^3+ 6x^2−9x+ 21

(c) x^4+ 7x^3+ 14

(d) x^5+ 18x + 6

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