What Happens?
What happens if I try to put a formula in Markdown? Does this work? Let me see.
Oh, dear. My first try did not look so good. But this looks OK…
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$
You need to put a link to MathJax JavaScript into your head. That sounds funny, doesn’t it. “Into your head.”
And you need double dollar signs, not just single dollar signs. Like this…
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$
Anyhow, it works now. Yay.