# How do you write 4a^-6 using only positive exponents?

Use this rule for exponents: ${x}^{\textcolor{red}{y}} = \frac{1}{x} ^ \textcolor{red}{- y}$
$4 {a}^{\textcolor{red}{- 6}} = \frac{4}{a} ^ \textcolor{red}{- - 6} = \frac{4}{a} ^ 6$