Find the roots of x3−2x2−x+2=0x^3 - 2x^2 - x + 2 = 0x3−2x2−x+2=0.
1,−1,21, -1, 21,−1,2
1,1,21, 1, 21,1,2
0,1,20, 1, 20,1,2
−1,−2,1-1, -2, 1−1,−2,1