6x2 + 15x - 9 = 0
x2 - 3x - 10 = 0
2x2 - 3x + 5 = 0
x2 + 6x - 7 = 0
3x2 + 5x - 2 = 0
5x2 + x - 6 = 0
2x2 + 7x - 9 = 0
7x2 - 14x + 7 = 0
5(x-2)2 - 45x = 0
4/5x2 - 7/5x -3/2 = 0