x2+7x+3=0x^{2}+7 x+3=0x2+7x+3=0
x2−3x+8=0x^{2}-3 x+8=0x2−3x+8=0
x2+7x+8=0x^{2}+7 x+8=0x2+7x+8=0
x2−7x+8=0x^{2}-7 x+8=0x2−7x+8=0