[tex] \bf ~~~~~~~~~~~~\textit{negative exponents}
\\\\
a^{-n} \implies \cfrac{1}{a^n}
\qquad \qquad
\cfrac{1}{a^n}\implies a^{-n}
\qquad \qquad
a^n\implies \cfrac{1}{a^{-n}}
\\\\
-------------------------------\\\\
\cfrac{4x^3y^6}{-2xy^8}\implies \cfrac{4}{-2}\cdot \cfrac{x^3y^6}{xy^8}\implies \cfrac{2}{-1}\cdot \cfrac{x^3x^{-1}}{y^8y^{-6}}\implies -2\cdot \cfrac{x^{3-1}}{y^{8-6}}
\\\\\\
-2\cdot \cfrac{x^2}{y^2}\implies \cfrac{-2x^2}{y^2} [/tex]
