| 4 | ( | 2 | X | + | 1 | ) | ( | 2 | X | + | 1 | ) | − | 9 | ( | 2 | X | − | 1 | ) | ( | 2 | X | − | 1 | ) | = | 0 |
| Left side of the equation = | 4 | × | 2 | X | ( | 2 | X | + | 1 | ) | + | 4 | × | 1 | ( | 2 | X | + | 1 | ) | − | 9 | ( | 2 | X | − | 1 | ) | ( | 2 | X | − | 1 | ) |
| = | 8 | X | ( | 2 | X | + | 1 | ) | + | 4 | ( | 2 | X | + | 1 | ) | − | 9 | ( | 2 | X | − | 1 | ) | ( | 2 | X | − | 1 | ) |
| = | 8 | X | × | 2 | X | + | 8 | X | × | 1 | + | 4 | ( | 2 | X | + | 1 | ) | − | 9 | ( | 2 | X | − | 1 | ) | ( | 2 | X | − | 1 | ) |
| = | 16 | X | X | + | 8 | X | + | 4 | ( | 2 | X | + | 1 | ) | − | 9 | ( | 2 | X | − | 1 | ) | ( | 2 | X | − | 1 | ) |
| = | 16 | X | X | + | 8 | X | + | 4 | × | 2 | X | + | 4 | × | 1 | − | 9 | ( | 2 | X | − | 1 | ) |
| = | 16 | X | X | + | 8 | X | + | 8 | X | + | 4 | − | 9 | ( | 2 | X | − | 1 | ) | ( | 2 | X | − | 1 | ) |
| = | 16 | X | X | + | 16 | X | + | 4 | − | 9 | ( | 2 | X | − | 1 | ) | ( | 2 | X | − | 1 | ) |
| = | 16 | X | X | + | 16 | X | + | 4 | − | 9 | × | 2 | X | ( | 2 | X | − | 1 | ) | + | 9 | × | 1 |
| = | 16 | X | X | + | 16 | X | + | 4 | − | 18 | X | ( | 2 | X | − | 1 | ) | + | 9 | ( | 2 | X | − | 1 | ) |
| = | 16 | X | X | + | 16 | X | + | 4 | − | 18 | X | × | 2 | X | + | 18 | X |
| = | 16 | X | X | + | 16 | X | + | 4 | − | 36 | X | X | + | 18 | X | + | 9 |
| = | 16 | X | X | + | 34 | X | + | 4 | − | 36 | X | X | + | 9 | ( | 2 | X | − | 1 | ) |
| = | 16 | X | X | + | 34 | X | + | 4 | − | 36 | X | X | + | 9 | × | 2 | X |
| = | 16 | X | X | + | 34 | X | + | 4 | − | 36 | X | X | + | 18 | X | − | 9 |
| = | 16 | X | X | + | 52 | X | − | 5 | − | 36 | X | X |
| 16 | X | X | + | 52 | X | − | 5 | − | 36 | X | X | = | 0 |
| X1= | 1 10 |
| X2= | 5 2 |