Equations in Google Blogger

I'm using something called jqMath  that uses MathML semantics, which seem a lot like LaTeX but different. Here's some examples:
Einstein's most famous equation is $E=mc^2$. Blah blah blah
Newton derived the equation $s=ut+\frac{1}{2}at^2$
$$x={-b±√{b^2-4ac}}/{2a}$$