Type some TeX code: x = {-b \pm \sqrt{b^2-4ac} \over 2a}. MathJax Output:${x = {-b \pm \sqrt{b^2-4ac} \over 2a}.}$ See also: MathJax MathJax (home) MathJax (wikipedia) MathJax TeX Samples TeX TeX Users Group web site (official) TeX (wikipedia) TeX Reference Card