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A
Homework Statement
A = \left(\begin{array}{cccc}
3 & 5 & -2 & 7\\
1 & 2 & -1 & 1\\
2 & 4 & 1 & 5\\
3 & 7 & 5 & 3
\end{array}
\right)Homework Equations
The Attempt at a Solution
R4=R4-R1
R3=R3-2R2
A = \left(\begin{array}{cccc}
3 & 5 & -2 & 7\\
1 & 2 & -1 & 1\\
0 & 0 & 3 & 3\\
0 & 2 & 7 & -4...