Question

log2(x-7)=2log23 Помогите решить!

Answer 1

Log2(x-7)=2log2(3 )
х-7=9
х=16

Answer 2

$log_{2} (x-7)=2 log_{2} 3$
ОДЗ:
$x-7\ \textgreater \ 0$
$x\ \textgreater \ 7$
$log_{2} (x-7)= log_{2} 3^2$
$log_{2} (x-7)= log_{2} 9$
$x-7=9$
$x=16$
Ответ: $16$