# How do you write 15^3/15^-4 using only positive exponents?

${x}^{\textcolor{red}{a}} / {x}^{\textcolor{b l u e}{b}} = {x}^{\textcolor{red}{a} - \textcolor{b l u e}{b}}$
${15}^{\textcolor{red}{3}} / {15}^{\textcolor{b l u e}{- 4}} = {15}^{\textcolor{red}{3} - \textcolor{b l u e}{- 4}} = {15}^{7}$