| ( | x | − | 45 | ) | ( | x | − | 45 | ) | + | 150 | × | 150 | = | x | x |
| Left side of the equation = | ( | x | − | 45 | ) | ( | x | − | 45 | ) | + | 22500 |
| ( | x | − | 45 | ) | ( | x | − | 45 | ) | + | 22500 | = | x | x |
| Left side of the equation = | x | ( | x | − | 45 | ) | − | 45 | ( | x | − | 45 | ) | + | 22500 |
| = | x | x | − | x | × | 45 | − | 45 | ( | x | − | 45 | ) | + | 22500 |
| = | x | x | − | 45 | x | − | 45 | x | + | 45 | × | 45 | + | 22500 |
| = | x | x | − | 45 | x | − | 45 | x | + | 2025 | + | 22500 |
| = | x | x | − | 90 | x | + | 24525 |
| x | x | − | 90 | x | + | 24525 | = | x | x |
| x= | 545 2 |