Question

$log _{2} x=3$

Answer 1

$log_{a}x=b\; \; \Rightarrow \; \; x=a^{b}\; ,\; \; \; \; x\ \textgreater \ 0,\; a\ \textgreater \ 0\, ,\, a\ne 1\\\\log_2x=3\; \; \; \Rightarrow \; \; \; x=2^3=8$