One "type" of problem

Sometimes displaying math text on the web is a pain.  There's LaTeX, but it's a hassle to employ in Blogger.    You can render your expressions elsewhere and use images, but I think the MathML code provided by Web Equation works pretty well if you don't mind writing your expression on the screen.

It did glitch on me a couple of times and require a page reload.

Here's a quick example: ${\displaystyle }$
${\displaystyle }$
${\displaystyle \mathrm{ <i>x</i>}=\frac{-b\pm <!--plus-minus\; sign-->\sqrt{b^2-4ac}}{2a}}$