| ( | 16 | − | x | ) | ( | 16 | − | x | ) | = | ( | 16 | − | 2 | x | ) | ( | 16 | − | 2 | x | ) | + | 12 | × | 12 |
| Left side of the equation = | 16 | ( | 16 | − | x | ) | − | x | ( | 16 | − | x | ) |
| = | 16 | × | 16 | − | 16 | x | − | x | ( | 16 | − | x | ) |
| = | 256 | − | 16 | x | − | x | ( | 16 | − | x | ) |
| = | 256 | − | 16 | x | − | x | × | 16 | + | x | x |
| = | 256 | − | 32 | x | + | x | x |
| 256 | − | 32 | x | + | x | x | = | ( | 16 | − | 2 | x | ) | ( | 16 | − | 2 | x | ) | + | 12 | × | 12 |
| Right side of the equation = | ( | 16 | − | 2 | x | ) | ( | 16 | − | 2 | x | ) | + | 144 |
| 256 | − | 32 | x | + | x | x | = | ( | 16 | − | 2 | x | ) | ( | 16 | − | 2 | x | ) | + | 144 |
| Right side of the equation = | 16 | ( | 16 | − | 2 | x | ) | − | 2 | x | ( | 16 | − | 2 | x | ) | + | 144 |
| = | 16 | × | 16 | − | 16 | × | 2 | x | − | 2 | x | ( | 16 | − | 2 | x | ) | + | 144 |
| = | 256 | − | 32 | x | − | 2 | x | ( | 16 | − | 2 | x | ) | + | 144 |
| = | 400 | − | 32 | x | − | 2 | x | ( | 16 | − | 2 | x | ) |
| = | 400 | − | 32 | x | − | 2 | x | × | 16 | + | 2 | x | × | 2 | x |
| = | 400 | − | 32 | x | − | 32 | x | + | 4 | x | x |
| = | 400 | − | 64 | x | + | 4 | x | x |
| 256 | − | 32 | x | + | x | x | = | 400 | − | 64 | x | + | 4 | x | x |