| ( | x | + | 219 500 | ) | ( | x | + | 114 25 | ) | = | 0 |
| 方程左边 = | x | ( | x | + | 114 25 | ) | + | 219 500 | ( | x | + | 114 25 | ) |
| = | x | x | + | x | × | 114 25 | + | 219 500 | ( | x | + | 114 25 | ) |
| = | x | x | + | 114 25 | x | + | 219 500 | x | + | 219 500 | × | 114 25 |
| = | x | x | + | 114 25 | x | + | 219 500 | x | + | 12483 6250 |
| = | x | x | + | 2499 500 | x | + | 12483 6250 |
| x | x | + | 2499 500 | x | + | 12483 6250 | = | 0 |
| x1= | - | 114 25 |
| x2= | - | 219 500 |