( | 18 | − | 2 | x | ) | ( | 10 | − | x | ) | = | 144 |
Left side of the equation = | 18 | ( | 10 | − | x | ) | − | 2 | x | ( | 10 | − | x | ) |
= | 18 | × | 10 | − | 18 | x | − | 2 | x | ( | 10 | − | x | ) |
= | 180 | − | 18 | x | − | 2 | x | ( | 10 | − | x | ) |
= | 180 | − | 18 | x | − | 2 | x | × | 10 | + | 2 | x | x |
= | 180 | − | 18 | x | − | 20 | x | + | 2 | x | x |
= | 180 | − | 38 | x | + | 2 | x | x |
180 | − | 38 | x | + | 2 | x | x | = | 144 |