x² +11x +28 = 0 (-7)

x² -9x +20 = 0

x² -13x +40 = 0

x² +4x +3 = 0

x² +8x +12 = 0

x² +7x +10 = 0

x² -12x +32 = 0

x² +11x +28 = 0

x² -10x +21 = 0

x² +8x +16 = 0

x² -9x +20 = 0

x² +5x +6 = 0

x² +3x +2 = 0

x² -9x +20 = 0

x² -10x +21 = 0

x² +5x +6 = 0

x² -12x +32 = 0

x² +11x +30 = 0

x² +6x +9 = 0

x² +7x +10 = 0

x² -4x +4 = 0

x² -9x +18 = 0

x² +3x +2 = 0

x² -3x +2 = 0

x² +9x +20 = 0

x² +10x +24 = 0

x² -13x +40 = 0

x² +11x +28 = 0

x² -3x +2 = 0

x² -15x +54 = 0