| ( | 1 | + | x | ) | ( | 1 | + | x | ) | × | 4 | = | 144 25 |
| 方程左边 = | 1 | ( | 1 | + | x | ) | × | 4 | + | x | ( | 1 | + | x | ) | × | 4 |
| = | 4 | ( | 1 | + | x | ) | + | x | ( | 1 | + | x | ) | × | 4 |
| = | 4 | × | 1 | + | 4 | x | + | x | ( | 1 | + | x | ) | × | 4 |
| = | 4 | + | 4 | x | + | x | ( | 1 | + | x | ) | × | 4 |
| = | 4 | + | 4 | x | + | x | × | 1 | × | 4 | + | x | x | × | 4 |
| = | 4 | + | 4 | x | + | x | × | 4 | + | x | x | × | 4 |
| = | 4 | + | 8 | x | + | x | x | × | 4 |
| 4 | + | 8 | x | + | x | x | × | 4 | = | 144 25 |
| x1= | - | 11 5 |
| x2= | 1 5 |