[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}} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \left( \cfrac{2}{5} \right)^{-2}\implies \left( \cfrac{5}{2} \right)^{+2}\implies \left( \cfrac{5^2}{2^2} \right)\implies \cfrac{25}{4}\implies 6\frac{1}{4} [/tex]
