Ecuaciones de 2do grado

x² +2x -80 = 0
x² +13x +40 = 0
3x² -108 = 0
x² -6x +8 = 0
x² -25 = 0
2x² +14x +20 = 0
3x² -12x -15 = 0
-2x² -12x +32 = 0
x² +16x +63 = 0
x² +13x +40 = 0
x² +x -42 = 0