Ecuaciones de 2do grado

x² +2x -3 = 0
-x² -8x -12 = 0
3x² +51x +216 = 0
2x² +10x -100 = 0
x² -12x +32 = 0
2x² -18x = 0
3x² -33x +54 = 0
-2x² -32x -120 = 0
-x² -2x +3 = 0
2x² -20x = 0
3x² -3 = 0