%% 
%%  A DANTE-Edition example
%% 
%%  Example 28-02-3 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{375.57637pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-func}

\begin{document}
\psset{yunit=0.4cm,xunit=0.8cm}
\begin{pspicture*}(-2,-5)(4,10)
 \psaxes[Dy=2,labelFontSize=\scriptstyle]{->}(0,0)(-3,-5)(4,10)
 \psset{linewidth=1pt,dotstyle=x}
 \psPolynomial[dotscale=2,Derivation=1,coeff=2 -1 -1 .5 -.1 .025,linecolor=red]{-2}{4}
 \psPolynomial[zeroLineTo=1,markZeros,dotscale=2,coeff=2 -1 -1 .5 -.1 .025,
               linecolor=blue]{-2}{4}
 \rput[lb](4,8){$g(x)$}
\end{pspicture*}
\quad
\begin{pspicture*}(-2,-5)(4,10)
 \psaxes[Dy=2,labelFontSize=\scriptstyle]{->}(0,0)(-3,-5)(4,10)
 \psset{linewidth=1pt}
 \psPolynomial[markZeros,dotscale=2,coeff=2 -1 -1 .5 -.1 .025,linecolor=cyan]{-2}{4}
 \rput[lb](4,8){$g(x)$}
\end{pspicture*}
\end{document}