factorise 3x3 - x2 - 3x +1 (it is x not multiplication sign) let x=1
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3x^3 - x^2 - 3x + 1
= x^2 ( 3x - 1 ) - 1 ( 3x - 1 )
= ( 3x - 1 ) ( x^2 - 1 )
= ( 3x - 1 ) ( x + 1 ) ( x - 1 )
= x^2 ( 3x - 1 ) - 1 ( 3x - 1 )
= ( 3x - 1 ) ( x^2 - 1 )
= ( 3x - 1 ) ( x + 1 ) ( x - 1 )
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