Ecuaciones de 2do grado

-x² -13x -42 = 0
3x² -24x +21 = 0
-2x² +200 = 0
-2x² +8x = 0
2x² -22x +48 = 0
-2x² +2x +4 = 0
-x² +8x -12 = 0
x² -16x +60 = 0
2x² +10x +12 = 0
x² -6x -27 = 0
3x² -108 = 0