Funktionen-Quadratische Funktion-Graph und Eigenschaften

$y = a\cdot x^{2} +b\cdot x+c$
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$Eigenschaften$
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Beispiel Nr: 18
$\begin{array}{l} \documentclass[a4paper]{article} \usepackage{amssymb} \usepackage{fontspec} \usepackage{xunicode} \usepackage{xltxtra} \usepackage{array} \usepackage{amsmath} \usepackage{geometry} \usepackage{pst-eucl} \usepackage{pstricks} \usepackage{pst-plot} \usepackage{pst-tree} \usepackage{graphicx} \geometry{verbose,letterpaper,tmargin=2cm,bmargin=2cm,lmargin=2cm,rmargin=2.5cm} \definecolor{hellgrau}{rgb}{0.95,0.95,0.95} \usepackage{mathpazo} \usepackage{epic,eepic} \newcounter{nr0} \pagenumbering{arabic} \setcounter{page}{1} \usepackage{fancyhdr} \pagestyle{fancy} %\fancyhf{\leftmark} \renewcommand{\sectionmark}[1]{\markboth{#1}{}} \renewcommand{\subsectionmark}[1]{\markright{#1}} \fancyhead[L]{\leftmark} \fancyhead[R]{\rightmark} \renewcommand{\headrulewidth}{0.5pt} \fancyfoot[L]{www.fersch.de} \fancyfoot[C]{\thepage} \renewcommand{\footrulewidth}{0.5pt} \begin{document} \parindent0em y = a\cdot x^{2} +b\cdot x+c \\ c=445\\ b=7\\ a=8\\ x=6\\ y = 8\cdot 6^{2} +7\cdot 6+5\\\\y=335 \end{document} \end{array}$