8 5 | = | ( | - | 25 8 | ) | ( | x | + | 5 2 | ) | ( | x | − | 5 2 | ) |
| 方程右边 = | - | 25 8 | ( | x | + | 5 2 | ) | ( | x | − | 5 2 | ) |
| = | - | 25 8 | x | ( | x | − | 5 2 | ) | − | 25 8 | × | 5 2 | ( | x | − | 5 2 | ) |
| = | - | 25 8 | x | ( | x | − | 5 2 | ) | − | 125 16 | ( | x | − | 5 2 | ) |
| = | - | 25 8 | x | x | + | 25 8 | x | × | 5 2 | − | 125 16 | ( | x | − | 5 2 | ) |
| = | - | 25 8 | x | x | + | 125 16 | x | − | 125 16 | ( | x | − | 5 2 | ) |
| = | - | 25 8 | x | x | + | 125 16 | x | − | 125 16 | x | + | 125 16 | × | 5 2 |
| = | - | 25 8 | x | x | + | 125 16 | x | − | 125 16 | x | + | 625 32 |
| = | - | 25 8 | x | x | + | 0 | x | + | 625 32 |
8 5 | = | - | 25 8 | x | x | + | 0 | x | + | 625 32 |
| x1= | - | √2869 √500 |
| x2= | √2869 √500 |