( | 1 2 | x | + | 40 | ) | ( | x | − | 72 | ) | = | x | ( | 1 2 | x | − | 40 | ) |
Left side of the equation = | 1 2 | x | ( | x | − | 72 | ) | + | 40 | ( | x | − | 72 | ) |
= | 1 2 | x | x | − | 1 2 | x | × | 72 | + | 40 | ( | x | − | 72 | ) |
= | 1 2 | x | x | − | 36 | x | + | 40 | ( | x | − | 72 | ) |
= | 1 2 | x | x | − | 36 | x | + | 40 | x | − | 40 | × | 72 |
= | 1 2 | x | x | − | 36 | x | + | 40 | x | − | 2880 |
= | 1 2 | x | x | + | 4 | x | − | 2880 |
1 2 | x | x | + | 4 | x | − | 2880 | = | x | ( | 1 2 | x | − | 40 | ) |
Right side of the equation = | x | × | 1 2 | x | − | x | × | 40 |
1 2 | x | x | + | 4 | x | − | 2880 | = | x | × | 1 2 | x | − | 40 | x |
x= | 720 11 |