Find the determinant of the matrix. Expand by cofactors on the row or column that appears to make the computations easiest.
1 2 0 0 –1
0 3 4 4 3
0 0 7 2 3
0 0 8 1 7
0 0 0 0 1
the whole problem is in brackets.
1 2 0 0 –1
0 3 4 4 3
0 0 7 2 3
0 0 8 1 7
0 0 0 0 1
the whole problem is in brackets.
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-27