| ( | x | + | 0 | ) | ( | x | + | 4 | ) | ( | x | + | 8 | ) | = | 0 |
| Left side of the equation = | x | ( | x | + | 4 | ) | ( | x | + | 8 | ) | + | 0 | ( | x | + | 4 | ) | ( | x | + | 8 | ) |
| = | x | x | ( | x | + | 8 | ) | + | x | × | 4 | ( | x | + | 8 | ) | + | 0 | ( | x | + | 4 | ) | ( | x | + | 8 | ) |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | ( | x | + | 8 | ) | + | 0 | ( | x | + | 4 | ) | ( | x | + | 8 | ) |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | x | × | 4 | × | 8 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | x | × | 32 | + | 0 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 |
| = | x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 |
| x | x | x | + | x | x | × | 8 | + | x | × | 4 | x | + | 32 | x | + | 0 | = | 0 |