ANSWER:
[tex]f^{-1}(x)=\frac{x-4}{8}[/tex]
STEP-BY-STEP EXPLANATION:
We have the following function:
[tex]f(x)=8x+4[/tex]
We calculate the inverse function as follows:
[tex]\begin{gathered} x=8\cdot f^{-1}(x)+4 \\ 8\cdot f^{-1}(x)=x-4 \\ f^{-1}(x)=\frac{x-4}{8} \end{gathered}[/tex]
