Talk:PlanetPhysics/Quadratic Equation

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%%% This file is part of PlanetPhysics snapshot of 2011-09-01 %%% Primary Title: quadratic equation %%% Primary Category Code: 02.10.-v %%% Filename: QuadraticEquation.tex %%% Version: 4 %%% Owner: bloftin %%% Author(s): pahio, bloftin %%% PlanetPhysics is released under the GNU Free Documentation License. %%% You should have received a file called fdl.txt along with this file. %%% If not, please write to gnu@gnu.org. \documentclass[12pt]{article} \pagestyle{empty} \setlength{\paperwidth}{8.5in} \setlength{\paperheight}{11in}

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% this is the default PlanetMath preamble. as your knowledge % of TeX increases, you will probably want to edit this, but % it should be fine as is for beginners.

% almost certainly you want these \usepackage{amssymb} \usepackage{amsmath} \usepackage{amsfonts}

% used for TeXing text within eps files %\usepackage{psfrag} % need this for including graphics (\includegraphics) %\usepackage{graphicx} % for neatly defining theorems and propositions %\usepackage{amsthm} % making logically defined graphics %\usepackage{xypic}

% there are many more packages, add them here as you need them

% define commands here

\begin{document}

The quadratic formula


\begin{equation} x \;=\; \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \end{equation}

can be used to find the solutions (roots) to a quadratic equation $$ax^2 + bc + c \;=\; 0.$$

\end{document}