LaTeX-examples/tikz/cubic-function-intermediate-value-theorem/cubic-function-intermediate-value-theorem.tex

\documentclass{article}
\usepackage[pdftex,active,tightpage]{preview}
\setlength\PreviewBorder{2mm}
\usepackage{pgfplots}
\usepackage{tikz}
\usetikzlibrary{arrows, positioning, calc, intersections, decorations.markings}
 
\begin{document}

% Define this as a command to ensure that it is same in both cases
\newcommand*{\ShowIntersection}[2]{
\fill 
    [name intersections={of=#1 and #2, name=i, total=\t}] 
    [red, opacity=1, every node/.style={above left, black, opacity=1}] 
    \foreach \s in {1,...,\t}{(i-\s) circle (2pt)
        node [above left] {\s}};
}

\begin{preview}
\begin{tikzpicture}
    \begin{axis}[
        %width=15cm, height=15cm,     % size of the image
        %xmin= 0,      % start the diagram at this x-coordinate
        %xmax= 250,    % end   the diagram at this x-coordinate
        %ymin=-7,     % start the diagram at this y-coordinate
        %ymax= 7,   % end   the diagram at this y-coordinate
        ylabel=y,
        xlabel=x,
        axis lines=left,
        tick style={draw=none},
        xticklabels={,,},
        yticklabels={,,}
    ]
      \addplot[name path global=a, domain=30:250, red, thick,samples=500] 
        {-0.00192*x*x*x+0.85*x*x-121.92*x+5815.75};
%        {-226/117649*x*x*x+100005/117649*x*x-14343768/117649*x+684216906/117649};
    \end{axis} 
\end{tikzpicture}
\end{preview}
\end{document}