107- If $f(x) = 2x + 3$ and $g(f(x)) = 8x^2 + 22x + 20$, what is the rule of $f \circ g$?
  • [(1)] $2x^2 - 7x + 3$
  • [(2)] $2x^2 - x + 7$
  • [(3)] $4x^2 - 2x + 13$
  • [(4)] $4x^2 - 4x + 11$
\textbf{107-} If $f(x) = 2x + 3$ and $g(f(x)) = 8x^2 + 22x + 20$, what is the rule of $f \circ g$?

\begin{itemize}
\item[(1)] $2x^2 - 7x + 3$
\item[(2)] $2x^2 - x + 7$
\item[(3)] $4x^2 - 2x + 13$
\item[(4)] $4x^2 - 4x + 11$
\end{itemize}