x2−5x+6=0x^{2}-5 x+6=0x2−5x+6=0
x2−4x+3=0x^{2}-4 x+3=0x2−4x+3=0
x2−11x+30=0x^{2}-11 x+30=0x2−11x+30=0
x2−2x+1=0x^{2}-2 x+1=0x2−2x+1=0
