Simple TeX

$${{ – b pm sqrt {{b^2} – 4ac} } over {2a}}$$

Instructions

  1. Add the following code the <head> section:
    <script type=”text/javascript” src=”http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML”></script>
  2. Paste in your TeX code.
    $${{ – b pm sqrt {{b^2} – 4ac} } over {2a}}$$