If $ax^2+bx+c=0$ with $a≠0$, then:
$$x={-b±√{b^2-4ac}}/{2a}$$
Some Fraktur letters: $\fr A$ $\fr B$ $\fr C$
To do this in your blog, choose “Design” or “Template”, and then “Edit HTML”. You need to add some things near the beginning of your HTML template. It may help you to use your browser’s “View Source” command on this page, to see how I’ve changed my template. The things you need to add are:
An attribute in your html tag: xmlns:m="http://www.w3.org/1998/Math/MathML"
Some lines early in your <head> (but probably after any 'X-UA-Compatible' element):
<link href='http://fonts.googleapis.com/css?family=UnifrakturMaguntia' rel='stylesheet'
type='text/css' />
<link rel="stylesheet" href="http://mathscribe.com/mathscribe/jqmath-0.4.3.css" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script>
<script src="http://mathscribe.com/mathscribe/jqmath-etc-0.4.3.min.js"></script>
The first <link> above is for Fraktur letters; if you don't use them, you can leave this link out, and your blog may load slightly faster.
Then in your blog posts, include jqMath strings as in:
If \$ax^2+bx+c=0\$ with \$a≠0\$, then: \$\$x={-b±√{b^2-4ac}}/{2a}\$\$Cheers, Dave B.
