| ( | 16 | − | t | ) | ( | 16 | − | t | ) | = | ( | 42 | − | 3 | t | ) | ( | 42 | − | 3 | t | ) | + | 144 |
| Left side of the equation = | 16 | ( | 16 | − | t | ) | − | t | ( | 16 | − | t | ) |
| = | 16 | × | 16 | − | 16 | t | − | t | ( | 16 | − | t | ) |
| = | 256 | − | 16 | t | − | t | ( | 16 | − | t | ) |
| = | 256 | − | 16 | t | − | t | × | 16 | + | t | t |
| = | 256 | − | 32 | t | + | t | t |
| 256 | − | 32 | t | + | t | t | = | ( | 42 | − | 3 | t | ) | ( | 42 | − | 3 | t | ) | + | 144 |
| Right side of the equation = | 42 | ( | 42 | − | 3 | t | ) | − | 3 | t | ( | 42 | − | 3 | t | ) | + | 144 |
| = | 42 | × | 42 | − | 42 | × | 3 | t | − | 3 | t | ( | 42 | − | 3 | t | ) | + | 144 |
| = | 1764 | − | 126 | t | − | 3 | t | ( | 42 | − | 3 | t | ) | + | 144 |
| = | 1908 | − | 126 | t | − | 3 | t | ( | 42 | − | 3 | t | ) |
| = | 1908 | − | 126 | t | − | 3 | t | × | 42 | + | 3 | t | × | 3 | t |
| = | 1908 | − | 126 | t | − | 126 | t | + | 9 | t | t |
| = | 1908 | − | 252 | t | + | 9 | t | t |
| 256 | − | 32 | t | + | t | t | = | 1908 | − | 252 | t | + | 9 | t | t |