<script src=
'https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
></script>
<script type=
"text/x-mathjax-config"
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<div style=
"background-color:yellow !important;display:table;width:100%;"
>
"float:left;background-color:white;"
>$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$</div>
"float:left;background-color:pink;font-size:12px;"
>$$y = {1 \over 2}$$</div>
</div>
$$x = {(11 - 2) * \sqrt{9} \over 3^2}$$
$$x = \frac{(11 - 2) * \sqrt{9}}{3^2}$$