x2 + 3x - 40 = (x + 8)(x - 5)
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(x + 8)(x - 5)
The factors are (x + 6) and (x - 3)
-3x3 - 6x2 + 189x = -3x(x2 + 2x - 63) = -3x(x + 9)(x - 7)
If you mean: x2+3x+2 then it is (x+1)(x+2) when factored
3x2 + 15x + 6 = 3*(x2 + 5x + 2). There are no further rational factors.