[tex]P(x)= x^{3}- x^{2}-3x+3\\\\ x^{3}- x^{2}-3x+3=0\\\\ x^ 2(x -1) -3(x-1 )=0\\\\(x-1)(x^2-3)=0\\\\(x-1)(x-\sqrt{3})(x+\sqrt{3})=0\\\\x-1=0 \ \ \ or\ \ \ x-\sqrt{3}=0 \ \ \ or \ \ x+\sqrt{3} =0\\\\x=1 \ \ \ or\ \ \ x=\sqrt{3} \ \ \ or \ \ x=-\sqrt{3} [/tex]
