| x | ( | x | − | 1 | ) | ( | x | − | 9 20 | ) | = | 0 |
| Left side of the equation = | x | x | ( | x | − | 9 20 | ) | − | x | × | 1 | ( | x | − | 9 20 | ) |
| = | x | x | x | − | x | x | × | 9 20 | − | x | × | 1 | ( | x | − | 9 20 | ) |
| = | x | x | x | − | x | x | × | 9 20 | − | x | × | 1 | x | + | x | × | 1 | × | 9 20 |
| = | x | x | x | − | x | x | × | 9 20 | − | x | × | 1 | x | + | x | × | 9 20 |
| x | x | x | − | x | x | × | 9 20 | − | x | × | 1 | x | + | 9 20 | x | = | 0 |
| x2= | 9 20 |
| x3=1 |