2x2−3x+1=02 x^{2}-3 x+1=02x2−3x+1=0
2x2+3x−1=02 x^{2}+3 x-1=02x2+3x−1=0
2x2−3x−1=02 x^{2}-3 x-1=02x2−3x−1=0
2x2+3x+1=02 x^{2}+3 x+1=02x2+3x+1=0