Mathematics, 19.03.2020 07:22, autumnplunkett09

Which of these trinomials are prime? x^2-7x-18 , x^2-9x-18 , x^2+3x-18 , x^2+17x-18

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Which of these trinomials are prime? x^2-7x-18 , x^2-9x-18 , x^2+3x-18 , x^2+17x-18...