Problem:
Find the characteristic polynomial of the following matrix:
$\left(
\begin{array}{ccc}
 -1 & -2 & 6 \\
 -4 & -9 & -3 \\
 2 & 7 & -6 \\
\end{array}
\right)$
Answer:
$-x^3-16 x^2-70 x-75$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/characteristic_polynomial/30860.txt'}