( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 4 | x | x | = | 0 |
Left side of the equation = | 1 | ( | 1 | − | x | ) | − | x | ( | 1 | − | x | ) | − | 4 | x | x |
= | 1 | × | 1 | − | 1 | x | − | x | ( | 1 | − | x | ) | − | 4 | x | x |
= | 1 | − | 1 | x | − | x | ( | 1 | − | x | ) | − | 4 | x | x |
= | 1 | − | 1 | x | − | x | × | 1 | + | x | x | − | 4 | x | x |
= | 1 | − | 2 | x | + | x | x | − | 4 | x | x |
1 | − | 2 | x | + | x | x | − | 4 | x | x | = | 0 |
x2= | 1 3 |