\documentclass{article}
\usepackage[dvipdfmx]{bxdpx-pstricks}% Don't forget dvipdfmx option!
\usepackage{pstricks-add}
\begin{document}
\begin{center}
The graph of $y=0.4x^{4}-2x^{2}+2x$.\par
\psset{unit=0.6}
\psset{algebraic=true, VarStep=true,VarStepEpsilon=0.001}
\begin{pspicture*}(-4,-6)(4,6)
\psaxes[linewidth=1.2pt,labels=none,ticks=none]{->}(0,0)(-4,-6)(4,6)
\psplot[linecolor=red]{-4}{4}{0.4*x^4-2*x^2+x}
\uput[240](4,0){$x$}\uput[210](0,6){$y$}\uput[135](0,0){$\mathrm{O}$}
\end{pspicture*}
\end{center}
\end{document}
