Ecuaciones de 2do grado

2x² -14x -36 = 0
-x² +1 = 0
x² -11x +10 = 0
x² -14x +48 = 0
x² +14x +40 = 0
x² +6x -40 = 0
x² +19x +90 = 0
-x² +5x +36 = 0
-2x² +10x -12 = 0
-x² -8x +9 = 0
-x² +1 = 0