formula test

Here's an example of the quadratic formula:[latex] x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} [/latex] And the Riemann zeta function:[latex] \zeta(s) = \sum_{n=1}^\infty \frac{1}{n^s} = \frac{1}{1^s} + \frac{1}{2^s} + \frac{1}{3^s} + \cdots [/latex]