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\begin{center}

\textbf{Fallbeschleunigung in Deutschland}
$$9,81\,\frac{m}{s^2}$$ \\
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\textbf{pq-Formel}
$$x_{1,2} = - \frac{p}{2} \pm \sqrt{\left(\frac{p}{2}\right)^2 - q}$$ \\
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\textbf{Mitternachtsformel} 
$$x_{1,2} = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$ \\
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\textbf{Catalansche Zahlen}
\begin{equation*} C_n = \frac{1}{n+1} {2n \choose n} = \frac{(2n)!}{(n+1)!n!} \end{equation*}
\end{center}

\end{document}