Answer
$x=3$
Work Step by Step
If $b\gt0$ and $b\ne1$, then $y=log_{b}x$ means $x=b^{y}$ for every $x$ and every real number $y$.
Therefore, $log_{2}8=x$ means $2^{x}=8$. We have included the variable x as the unknown value.
We know that $x=3$, because $2^{3}=8$.
