Question

Решите уравнение логорифмическое

Answer 1

$log_{7}( frac{x + 4}{15} times frac{5}{x + 1} ) = log_{7}(7) \ frac{x + 4}{15} times frac{5}{x + 1} = 7 \ frac{5x + 20}{15x + 15} = 7 \ 5x + 20 = 7(15x + 15) \ 5x + 20 = 105x + 105 \ - 100x = 85 \ x = - 0.85$