Problem:
Convert the following matrix to reduced row echelon form:
$\left(
\begin{array}{cccc}
 2 & 7 & -9 & -4 \\
 -9 & -5 & -10 & -5 \\
 10 & 9 & -5 & -7 \\
 8 & 4 & 8 & 10 \\
\end{array}
\right)$.
Answer:
$\left(
\begin{array}{cccc}
 1 & 0 & 0 & 0 \\
 0 & 1 & 0 & 0 \\
 0 & 0 & 1 & 0 \\
 0 & 0 & 0 & 1 \\
\end{array}
\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/row_reduce/26012.txt'}