# MathJax Forms Q

# Content

# Q.E.D.

A proof termination symbol has to be hacked. A black square can be used in a tag or the three dots for therefore can precede the final equation. {$$ \therefore a = b \tag*{$\blacksquare$} $$}

MathJax code

{$$ \therefore a = b \tag*{$\blacksquare$} $$}

# Quadratic Formula

{$$ \large {x = \frac{{ - b \pm \sqrt {b^2 - 4ac} }}{{2a}}} $$}

{$$ \large {x = \frac{{ - b \pm \sqrt {b^2 - 4ac} }}{{2a}}} $$}

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**Category:** MathJaxForms

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