Question

Решите уравение:
(5х-1)(5х+1)-5х(5х+2)=4
Распишите полностью

Answer 1

$(5x - 1)(5x + 1) - 5x(5x + 2) = 4 \ 25 {x}^{2} - 1 - 25 {x}^{2} - 10x = 4 \ - 1 - 10x = 4 \ - 10x = 4 + 1 \ - 10x = 5 \ x = - frac{5}{10} = - frac{1}{2} = - 0.5 = - 2 {}^{ - 1}$