This is an inline math expression: $\frac{-b\pm\sqrt{{{b}^{2}}-4ac}}{2a}$.
This is displayed:
\[\begin{matrix} 1 & 2 & \phi� & \pi�� \\ � \theta� & \beta� & \sqrt{2} & \partial x�\\ a\otimes b & \lambda� & \Gamma� & {{\pi }^{2}}� \\ 4! & \Xi� & \Delta y & -3� \\ \end{matrix}\]