| 1.5x² + 13.5x = 0 x1 = -9 , x2 = 0 | 5x² + 50x + 105 = 0 x1 = -7 , x2 = -3 |
| 7.5x² + 45x - 202.5 = 0 x1 = -9 , x2 = 3 | 2x² - 12x + 18 = 0 x1 = 3 , x2 = 3 |
| -9x² - 90x - 216 = 0 x1 = -6 , x2 = -4 | 7x² - 7x - 14 = 0 x1 = -1 , x2 = 2 |
| -7.5x² + 75x - 120 = 0 x1 = 2 , x2 = 8 | x² - 10x + 16 = 0 x1 = 2 , x2 = 8 |
| 10x² + 90x + 200 = 0 x1 = -5 , x2 = -4 | 8x² - 16x - 120 = 0 x1 = -3 , x2 = 5 |
| -8x² + 160x - 800 = 0 x1 = 10 , x2 = 10 | 6x² - 12x - 210 = 0 x1 = -5 , x2 = 7 |
| 0.5x² + 7.5x + 25 = 0 x1 = -10 , x2 = -5 | 5x² - 40x = 0 x1 = 0 , x2 = 8 |
| -x² + 8x + 9 = 0 x1 = -1 , x2 = 9 | 3x² + 42x + 144 = 0 x1 = -8 , x2 = -6 |
| 6.5x² - 416 = 0 x1 = -8 , x2 = 8 | -6x² + 216 = 0 x1 = -6 , x2 = 6 |
| 2.5x² + 17.5x - 75 = 0 x1 = -10 , x2 = 3 | 9.5x² + 123.5x + 399 = 0 x1 = -7 , x2 = -6 |