How to draw two arrows, one in the numerator and another one in the denominator in equations?

Question

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{amsfonts}

\begin{document}
\begin{equation}
H(\&)=  \dfrac{R_1 + R_2(\&C_2R_1 +1)}{\&C_2R_1 +1}
\end{equation}
\end{document}

I would like to achieve the following output:

Answer 1

You can use a simple array environment, based on this answer:

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{amsfonts}

\begin{document}

\begin{equation}
 H(\&)=  \dfrac{R_1 + R_2(\&C_2R_1 +1)}{\&C_2R_1 +1}\begin{array}{l}
\rightarrow \text{Ceros}\\
\rightarrow \text{Polos}
\end{array}

\end{equation}
\end{document}

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Related: Case equation without curly brace.