Question

Помогите мне пожалуйста!!! log11(x+9)= log12(x+9)

Answer 1

ОДЗ: x > -9
log11(x+9) = log12(x+9) = a

11^a = 12^a |:(12^a)
(11/12)^a = 1
(11/12)^a = (11/12)^0
a = 0

x+9 = 11^0 = 12^0 = 1
x = -8

Ответ: -8