How to switch x- and y-axes?

Question

Is there a simple way to switch the x- and y-axes, so that the x-axis becomes the vertical axis?

\begin{tikzpicture}
\begin{axis}
\addplot+[domain=0:10]{1.2*0.000001*(0.2*(x*1000)^2 + 700*x*1000 + 25000)*2};
\end{axis}
\end{tikzpicture}

Answer 1

Instead of plotting \addplot {<math expression>}, you can use \addplot ({<x math expression>},{<y math expression>}), so in your case

\addplot+[domain=0:10] ({1.2*0.000001*(0.2*(x*1000)^2 + 700*x*1000 + 25000)*2},{x});

\documentclass[border=5mm]{standalone}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
\begin{axis}
\addplot+[domain=0:10](1.2*0.000001*(0.2*(x*1000)^2 + 700*x*1000 + 25000)*2,x);
\end{axis}
\end{tikzpicture}
\end{document}