| 1 | -2 | -1 | 2 |
--------------------------------------------------------------
1 | 1 | 1*1-2=-1 | 1*(-1)+(-1)=-2 | 1*(-2)+2=0 |
(x-1)(x²-1*x-2)=0
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| 1 | -2 | -1 | 2 |
--------------------------------------------------------------
1 | 1 | 1*1-2=-1 | 1*(-1)+(-1)=-2 | 1*(-2)+2=0 |
(x-1)(x²-1*x-2)=0