find all the zeroes of x^3-2x^2-x+2
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x^3 - 2x^2 - x + 2
= x^3 - x^2 - x^2 + x - 2x + 2
= x^2(x -1) - x(x - 1) - 2(x - 1)
= (x - 1)(x^2 - x - 2)
= (x - 1)(x^2 - 2x + x - 2)
= (x - 1)(x(x - 2) + 1(x - 2))
= (x - 1)(x + 2)(x + 1) Ans....
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