Question

Lg3(5-x)+log3(-1x-x)=3
3 маленькая
Очень срочно помните плз

Answer 1

$log_3(5-x)+log_3(-1-x)=3, \ left { {{5-x textgreater 0,} atop {-1-x textgreater 0;}} right. left { {{x textless 5,} atop {x textless -1;}} right. x textless -1; \ log_3(5-x)(-1-x)=log_33^3, \ x^2-4x-5=27, \ x^2-4x-32-0, \ x_1=-4, x_2=8 textgreater -1, \ x=-4.$