Playing with mathjax

HTML

<script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_CHTML"></script>
<p>
When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
</p>

<p style="color:#00F;">
TeX to ignore:
</p>

<p class="tex2jax_ignore">
$$ \frac{1}{2} $$
</p>

<script type="text/x-mathjax-config">
MathJax.Hub.Config({   tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]} });
</script>