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=x^3 - x^2 - 5x +2x^2 - 2x^2 + 3x - 3x -3
=x^3 - 2x^2 -3x + ( -x^2 + 2x^2 - 5x + 3x -3 )
=(x^3 - 2x^2 - 3x) + (x^2 - 2x -3)
=x(x^2 -2x-3) + (x^2 - 2x -3)
=(x + 1)(x^2 - 2x -3)
=(x + 1)(x - 3)(x + 1)