0
x3 + x2 - 8x - 6 = 0
x3 + 3x2 - 2x2 - 6x - 2x - 6 = 0
x2(x + 3) - 2x(x + 3) - 2(x + 3) = 0
(x + 3)(x2 - 2x - 2) = 0
The second bracket cannot be factorised, so applying the quadratic formula to it gives the answers as
So x = -3 or x = 1 +/-sqrt(3)
that is,
x = -3, x = -0.732051 or x = 2.732051
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