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The roots of the polynomial $a x^{2} + b x + c$ are given, in fields of characteristic other than $2$ , by the formula $x = \frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a} .$

The following graphic image represents a screenshot of the rendering of the preceding paragraph by Firefox 4.0 beta 6.

image of quadratic polynomial with formula for roots

If the rendering in the second paragraph does not match the graphic image, your browser may not support MathML. However, it may still work with MathJax, which, though slower, works in most web browsers and requires no special installations by the user. Try this page:

https://www.albany.edu/~hammond/mjquadform.html

Most major web browsers support HTML 5.