| ( | x | + | 2000 | ) | ( | x | + | 2000 | ) | = | 16 | × | 2000 |
| Left side of the equation = | x | ( | x | + | 2000 | ) | + | 2000 | ( | x | + | 2000 | ) |
| = | x | x | + | x | × | 2000 | + | 2000 | ( | x | + | 2000 | ) |
| = | x | x | + | 2000 | x | + | 2000 | x | + | 2000 | × | 2000 |
| = | x | x | + | 2000 | x | + | 2000 | x | + | 4000000 |
| = | x | x | + | 4000 | x | + | 4000000 |
| x | x | + | 4000 | x | + | 4000000 | = | 16 | × | 2000 |
| Right side of the equation = | 32000 |
| x | x | + | 4000 | x | + | 4000000 | = | 32000 |