Question

logx 81 = 4 ?

Answer 1

I assume this means: log(x) * 81 = 4.

1. Divide both sides by 81. --> log(x) = 4/81
2. Get rid of the log. You do this by raising both side to base e.

e^log(x) = e^(4/81) ---> log disappears
x = e^(4/81)