Question

Rezolvaţi ecuaţiile:
1) logx din 1 supra 81= 4​

Answer 1

$\log_{\displaystyle x}\frac{1}{81}=4\\ \\ \Leftrightarrow \, \dfrac{1}{81} = x^4\\ \\ \Leftrightarrow\, x = +\sqrt[4]{\dfrac{1}{81}}\\ \\ \Rightarrow\, \boxed{x = \dfrac{1}{3}}$