It is hoped that any serious mathematics content contributor will be thoroughly familiar with LaTeX. Otherwise to generate the text required to display equations, use the CodeCogs LaTeX Equation Generator.
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It can easily be seen, by polynomial expansion, that the following equation is equivalent to the quadratic equation:
Taking the square root of both sides, and isolating , gives:
Use images from your favoured applcation, also see Wikipedia:How to create charts for Wikipedia articles.