# How do you write 20^-4 using only positive exponents?

${x}^{\textcolor{red}{a}} = \frac{1}{x} ^ \textcolor{red}{- a}$
${20}^{\textcolor{red}{- 4}} = \frac{1}{20} ^ \textcolor{red}{- - 4} = \frac{1}{20} ^ 4$