| ( | 2 | x | + | 3 | ) | ( | 2 | x | + | 3 | ) | − | 4 | ( | 2 | x | + | 3 | ) | × | 0 | = | 0 |
| 方程左边 = | ( | 2 | x | + | 3 | ) | ( | 2 | x | + | 3 | ) | − | 0 | ( | 2 | x | + | 3 | ) |
| ( | 2 | x | + | 3 | ) | ( | 2 | x | + | 3 | ) | − | 0 | ( | 2 | x | + | 3 | ) | = | 0 |
| 方程左边 = | 2 | x | ( | 2 | x | + | 3 | ) | + | 3 | ( | 2 | x | + | 3 | ) | − | 0 | ( | 2 | x | + | 3 | ) |
| = | 2 | x | × | 2 | x | + | 2 | x | × | 3 | + | 3 | ( | 2 | x | + | 3 | ) | − | 0 | ( | 2 | x | + | 3 | ) |
| = | 4 | x | x | + | 6 | x | + | 3 | ( | 2 | x | + | 3 | ) | − | 0 | ( | 2 | x | + | 3 | ) |
| = | 4 | x | x | + | 6 | x | + | 3 | × | 2 | x | + | 3 | × | 3 |
| = | 4 | x | x | + | 6 | x | + | 6 | x | + | 9 |
| = | 4 | x | x | + | 12 | x | + | 9 |
| 4 | x | x | + | 12 | x | + | 9 | = | 0 |
| x1= | - | 3 2 |
| x2= | - | 3 2 |