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Write the exponential function.$\newline$\begin{tabular}{|c|c|}$\newline$\hline$x$ & $f(x)$ \\$\newline$\hline$-1$ & $8$ \\$\newline$\hline $0$ & $4$ \\$\newline$\hline $1$ & $2$ \\$\newline$\hline $2$ & $1$ \\$\newline$\hline$\newline$\end{tabular}