Find x such that log_x {81} = log_2 {16}.
log_x {81} = log_2 {16}.
\(log_x {81} = log_2 {16}\\ log_x {3^4} = log_2 {2^4}\\ 4log_x {3} =4 log_2 {2}\\ log_x {3}=1\\ x=3 \)
