Check out these links:

• Latex/Mathematics on Wikibooks
• Latex/Advanced_Mathematics on Wikibooks

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You can use the text below as an example:

When \( a \ne 0 \), there are two solutions to \(ax^2 + bx + c = 0\) and they are
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$