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Anonymous
It is 2.
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x2-3x-28
3x^3
(x2+3x-4) (x-4)
If you mean: x2+3x+2 then it is (x+1)(x+2) when factored
x2 + 3x + 7 = 5 ∴ x2 + 3x + 2 = 0 ∴ (x + 1)(x + 2) = 0 ∴ x ∈ {-2, -1}