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Anonymous
(n + 4) and (n - 5) are factors of n^2 - n - 20
They cannot be factored further.
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(3x - 4)(2x^2 + 6x + 5)
(x - 5)(x - 3)
6ab(2x2+x-5)
k = 7 x^4 - 5x^3 + 7x^2 + 3x - 10 = (x + 1)(x - 2)(x^2 - 4x + 5)
4(7 + 5)