x3+3x2+3x+1=0x^{3}+3 x^{2}+3 x+1=0x3+3x2+3x+1=0
x3−3x2+3x−1=0x^{3}-3 x^{2}+3 x-1=0x3−3x2+3x−1=0
x3−3x2−3x−1=0x^{3}-3 x^{2}-3 x-1=0x3−3x2−3x−1=0
x3−3x2−3x+1=0x^{3}-3 x^{2}-3 x+1=0x3−3x2−3x+1=0