\usepackage{longtable}

\begin{longtable}{p{8cm}|p{8cm}}
	\textbf{Instrucciones} & \textbf{Resultados} \\ \hline
\begin{lstlisting}
I=(pi/8-8/(9*pi)).*[1.5:0.5:3];
\end{lstlisting}
	&
\begin{lstlisting}
I =

    0.1646    0.2195    0.2744    0.3293
\end{lstlisting}
	\\ \hline
\end{longtable}