Question

в корне7х-1=2
$sqrt{7x - 1} = 2$
Помогите решить

Answer 1

$sqrt{7x - 1} = 2 \ 7x - 1 = 4 \ 7x = 4 + 1 \ 7x = 5 div 7 \ x = frac{5}{7} \ \ sqrt{7 frac{5}{7} - 1 } = 2 \ \ 2 = 2 \ \ x = frac{5}{7}$