%% 
%%  A DANTE-Edition example
%% 
%%  Example 28-02-4 on page 523.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-func}

\begin{document}
\psset{xunit=1.25,yunit=0.75}
\begin{pspicture*}(-4,-5)(4,5)
 \psaxes[labelFontSize=\scriptstyle]{->}(0,0)(-4,-5)(4,5)
 \psset{dotscale=2,dotstyle=x,zeroLineStyle=dotted,zeroLineWidth=1pt}
 \psPolynomial[markZeros,linewidth=2pt,coeff=-1 1 -1 0 0.15]{-4}{3}
 \psPolynomial[markZeros,linecolor=red,linewidth=1pt,linestyle=dashed,
               coeff=-1 1 -1 0 0.15,Derivation=1,zeroLineTo=0]{-4}{3}
 \psPolynomial[markZeros,linecolor=magenta,linewidth=1pt,linestyle=dotted,
               coeff=-1 1 -1 0 0.15,Derivation=2,zeroLineTo=0]{-4}{3}
\end{pspicture*}
\end{document}