28 | ( | 1 | + | ( | 7 200 | x | × | 1 2 | ) | ) | = | 0 |
Left side of the equation = | 28 | × | 1 | + | 28 | ( | 7 200 | x | × | 1 2 | ) |
= | 28 | + | 28 | ( | 7 200 | x | × | 1 2 | ) |
= | 28 | + | 28 | × | 7 200 | x | × | 1 2 |
= | 28 | + | 49 100 | x |
28 | + | 49 100 | x | = | 0 |
49 100 | x | = | 0 | − | 28 |
49 100 | x | = | - | 28 |
x | = | - | 28 | ÷ | 49 100 |
= | - | 28 | × | 100 49 |
= | - | 4 | × | 100 7 |
x | = | - | 400 7 |
x | = | - 57.142857 |