| x2 - 4x - 5 = | x2 + x - 6 = | x2 + 5x +6 = | x2 -6x + 8 = |
| x2 + 7x + 6 = | x2-8x +15 = | x2+11x +10= | x2+9x -10 = |
| x2 -9x+14 = | x2-10x-11 = | x2-14x+24 = | x2-11x+24 = |
| x2-10x+24 = | x2-25x+24 = | x2 -7x +12 = | x2+7x +12 = |
| x2 - x - 12 = | x2 + x -12 = | x2 + 3x - 4 = | x2- 5x + 4 = |