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# 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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