Как найти х х^-4=5^1/2

[latex]x^{-4}=5^{\frac{1}{2}}\; ,\; \; \; ODZ:\; x\ \textgreater \ 0\\\\(x^{-4})^{-\frac{1}{4}}=(5^{\frac{1}{2}})^{-\frac{1}{4}}\\\\x=5^{-\frac{1}{8}}\\\\x=\frac{1}{\sqrt[8]5}[/latex] [latex]P.S.\qquad (x^{n})^{k}=x^{nk}[/latex]