To use 
$latex x = \frac{ - b \pm \sqrt{b^2 - 4 a c} }{2 a}
then you can close it with another dollar sign:
$.
Putting it all together, the renderer will give you:
Basically, it’s like writing latex, except that every time you have to go into math mode, you have to type “latex” right after the first dollar sign.
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Now, if only wordpress can make it so the images have a transparent background instead of a white background. They use PNGs for the images, so there really is no excuse on their part.
Yeah, it looks pretty atrocious in RSS readers without a white background. I had some problems with transparency in PNGs due to cross-platform issues (creating the transparency on a Mac wouldn’t read in Windows), so maybe they’re “playing it safe?” That was a few years ago, though….
wow, it works 😀