Problem:
Find the characteristic polynomial of the following matrix:
$\left(
\begin{array}{cc}
 -9 & \frac{11}{4} \\
 -5 & 4 \\
\end{array}
\right)$
Answer:
$x^2+5 x-\frac{89}{4}$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/characteristic_polynomial/33320.txt'}