Question

factorise : x^3-2x^2-x+2

Answer 1

If x=1
It satisfies the equation
If x=-1
It satisfies the equation
If x=2
It satisfies the equation(x+1)(x-1)(x-2)=0

Answer 2

${x}^{3} - 2 {x}^{2} - x + 2 \\ = {x}^{2} (x - 2) - (x - 2) \\ = ( {x}^{2} - 1)(x - 2) \\ = ( {x}^{2} - {1}^{2} )(x - 2) \\ = (x - 1)(x + 1)(x - 2) \\ \\ hence \: factorised \:$
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