When a≠0a≠0, there are two solutions to ax2+bx+c=0ax2+bx+c=0 and they are
The Lorenz Equations
The Cauchy-Schwarz Inequality
A Cross Product Formula
The probability of getting kk heads when flipping nn coins is:
An Identity of Ramanujan
A Rogers-Ramanujan Identity
Finally, while display equations look good for a page of samples, the ability to mix math and text in a paragraph is also important. This expression 3x−1‾‾‾‾‾‾√+(1+x)23x−1+(1+x)2 is an example of an inline equation. As you see, MathJax equations can be used this way as well, without unduly disturbing the spacing between lines.