(3x - 30)(x + 8)
can also simplify to
3(x - 10)(x + 8)
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x3 + 3x2 - 6x - 8 = (x - 2)(x2 + 5x + 4) = (x - 2)(x + 1)(x + 4)
6x(1+4)
(6x + 5)(6x - 5)
3x2 + 2x - 8 = 3x2 + 6x - 4x - 8 = 3x(x + 2) - 4(x + 2) = (x + 2)(3x - 4).
(3x2 - 6x)/3x = 3x(x-2)/3x = x-2, for x<>0