| ( | 2 | k | + | 1 | ) | ( | 2 | k | + | 1 | ) | − | 2 | ( | 4 | k | − | 3 | ) | ( | 4 | k | − | 3 | ) | = | 31 |
| Left side of the equation = | 2 | k | ( | 2 | k | + | 1 | ) | + | 1 | ( | 2 | k | + | 1 | ) | − | 2 | ( | 4 | k | − | 3 | ) | ( | 4 | k | − | 3 | ) |
| = | 2 | k | × | 2 | k | + | 2 | k | × | 1 | + | 1 | ( | 2 | k | + | 1 | ) | − | 2 | ( | 4 | k | − | 3 | ) | ( | 4 | k | − | 3 | ) |
| = | 4 | k | k | + | 2 | k | + | 1 | ( | 2 | k | + | 1 | ) | − | 2 | ( | 4 | k | − | 3 | ) | ( | 4 | k | − | 3 | ) |
| = | 4 | k | k | + | 2 | k | + | 1 | × | 2 | k | + | 1 | × | 1 | − | 2 | ( | 4 | k | − | 3 | ) |
| = | 4 | k | k | + | 2 | k | + | 2 | k | + | 1 | − | 2 | ( | 4 | k | − | 3 | ) | ( | 4 | k | − | 3 | ) |
| = | 4 | k | k | + | 4 | k | + | 1 | − | 2 | ( | 4 | k | − | 3 | ) | ( | 4 | k | − | 3 | ) |
| = | 4 | k | k | + | 4 | k | + | 1 | − | 2 | × | 4 | k | ( | 4 | k | − | 3 | ) | + | 2 | × | 3 |
| = | 4 | k | k | + | 4 | k | + | 1 | − | 8 | k | ( | 4 | k | − | 3 | ) | + | 6 | ( | 4 | k | − | 3 | ) |
| = | 4 | k | k | + | 4 | k | + | 1 | − | 8 | k | × | 4 | k | + | 8 | k |
| = | 4 | k | k | + | 4 | k | + | 1 | − | 32 | k | k | + | 24 | k | + | 6 |
| = | 4 | k | k | + | 28 | k | + | 1 | − | 32 | k | k | + | 6 | ( | 4 | k | − | 3 | ) |
| = | 4 | k | k | + | 28 | k | + | 1 | − | 32 | k | k | + | 6 | × | 4 | k |
| = | 4 | k | k | + | 28 | k | + | 1 | − | 32 | k | k | + | 24 | k | − | 18 |
| = | 4 | k | k | + | 52 | k | − | 17 | − | 32 | k | k |
| 4 | k | k | + | 52 | k | − | 17 | − | 32 | k | k | = | 31 |