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Factorise x3-2x2-x+2
To do: Factorise x3-2x2-x+2
Solution:
$x^{3}-2 x^{2}-x+2$
$\ = x^{2}(x-2)-1(x-2)$
$\ =\left(x^{2}-1\right)(x-2)$
$\ =\left(x^{2}-1^{2}\right)(x-2)$
$\ =(x+1)(x-1)(x-2)$
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