Question 529808
Let's see if I understand what you are saying.

{{{2 *log(4,x) = 8}}}

Divide by 2 on both sides.

{{{log(4,x) = 4}}}

Exponentiate both sides by 4.

{{{4^(log(4,x)) = 4^4}}}
{{{x = 4^4}}}
{{{x = 256}}}