6x2−3x+1=06 x^{2}-3 x+1=06x2−3x+1=0
5x2+3x−1=05 x^{2}+3 x-1=05x2+3x−1=0
5x2−3x+1=05 x^{2}-3 x+1=05x2−3x+1=0
3x2−5x+1=03 x^{2}-5 x+1=03x2−5x+1=0