| ( | X | − | 1869 2 | ) | ( | X | − | 131 2 | ) | = | 0 |
| Left side of the equation = | X | ( | X | − | 131 2 | ) | − | 1869 2 | ( | X | − | 131 2 | ) |
| = | X | X | − | X | × | 131 2 | − | 1869 2 | ( | X | − | 131 2 | ) |
| = | X | X | − | 131 2 | X | − | 1869 2 | X | + | 1869 2 | × | 131 2 |
| = | X | X | − | 131 2 | X | − | 1869 2 | X | + | 244839 4 |
| = | X | X | − | 1000 | X | + | 244839 4 |
| X | X | − | 1000 | X | + | 244839 4 | = | 0 |
| X= | 131 2 |