Question

$log_{2} (11- x)=4 log_{2} 5$

Answer 1

$log_{2}(11-x)=4log_{2}5; 11-x>0 \ log_{2}(11-x)=log_{2}5^{4} \ 11-x=5^{4} \ 11-x=625 \ x=11-625 \ x=-614$

Answer 2

log_2(11-x)=4log_2 5
ОДЗ x<11
log_2(11-x)=log_2 5^4
11-x=5^4
x=11-625
x=-614