# How do you simplify and write a^2b^-4 with positive exponents?

${x}^{\textcolor{red}{a}} = \frac{1}{x} ^ \textcolor{red}{- a}$
${a}^{2} {b}^{\textcolor{red}{- 4}} \implies {a}^{2} / {b}^{\textcolor{red}{- - 4}} \implies {a}^{2} / {b}^{4}$