x2+3x-4=0 x2-5x+4=0 2x2-6x-20=0
-x2 - 2 x + 63 = 0
-4x2 + 28 x + 72 = 0
x2 - 4 = 0
3x2 + 24 x - 60 = 0
-3x2 + 42 x - 135 = 0
x2 - 15 x + 56 = 0
x2 - 16 x + 70 = 0
x2 + 10 x + 27 = 0
-5x2 - 40 x - 60 = 0
-3x2 + 12 x - 30 = 0
3x2 + 36 x + 96 = 0
4x2 - 324 = 0
x2 + 5 x - 6 = 0
-3x2 + 9 x - 6 = 0
-4x2 - 20 x + 144 = 0
x2 - 2 x - 3 = 0
4x2 + 56 x + 192 = 0
-5x2 - 70 x - 225 = 0
4x2 + 48 x + 144 = 0
4x2 + 80 x + 420 = 0