Untuk a < 1

\begin{equation*} \begin{split} a^{f(x)} & > a^{g(x)} \\\\ \cancel {a}^{f(x)} & > \cancel {a}^{g(x)} \\\\ f(x) & < g(x) \quad {\color {blue} \text{(tanda berubah)}} \end{split} \end{equation*}