| ( | 4 | − | k | ) | × | 2 | ( | k | − | 3 | ) | = | 0 |
| Left side of the equation = | 4 | × | 2 | ( | k | − | 3 | ) | − | k | × | 2 | ( | k | − | 3 | ) |
| = | 8 | ( | k | − | 3 | ) | − | k | × | 2 | ( | k | − | 3 | ) |
| = | 8 | k | − | 8 | × | 3 | − | k | × | 2 | ( | k | − | 3 | ) |
| = | 8 | k | − | 24 | − | k | × | 2 | ( | k | − | 3 | ) |
| = | 8 | k | − | 24 | − | k | × | 2 | k | + | k | × | 2 | × | 3 |
| = | 8 | k | − | 24 | − | k | × | 2 | k | + | k | × | 6 |
| = | 14 | k | − | 24 | − | k | × | 2 | k |
| 14 | k | − | 24 | − | k | × | 2 | k | = | 0 |