Question

log3 (x+1)+log3 (x+3)=1

Answer 1

$log_{3}(x+1) + log_{3}(x+3) = 1 \ log_{3}((x+1)(x+3))=1\ (x+1)(x+3)=3^1\ x^2+4x=0 \ x=0 ; x=-4$ 
Ответ $x=0$