Question

Решите уравнение:
$\frac{200}{15+x}$ + $\frac{200}{15-x}$ = 30

Answer 1

200*(15-x)+200*(15+x) = 30*(225-x²)

3000-200x+3000+200x = 6750-30x²

6000 = 6750-30x²

30x² = 6750 - 6000

30x² = 750

x² = 750:30

x² = 25

x = 5