x³-2x²-x+2 factorise
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x^3 - 2x^2 - x + 2
=> x^3 - x - 2x^2 + 2
=> x ( x^2 - 1) - 2( x^2 - 1)
=> ( x^2 - 1)(x - 2)
=> [ (x)^2 - (1)^2] ( x - 2)
=> ( x + 1)(x - 1)(x - 2)
=> x^3 - x - 2x^2 + 2
=> x ( x^2 - 1) - 2( x^2 - 1)
=> ( x^2 - 1)(x - 2)
=> [ (x)^2 - (1)^2] ( x - 2)
=> ( x + 1)(x - 1)(x - 2)
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