use elementary matrices to find the determinant of the matrix A
A = (2 5 -1),(-1 -1 5), (3 7 -3)
solution I found:
-36
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To count trace, determinant, etc. I suggest you the site http://matrix.reshish.com/ You can also find detailed solutions, etc. – Atvin Mar 25 '15 at 18:14
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1The correct answer is $0$. Show us what you did and we can find your mistake. – Rory Daulton Mar 25 '15 at 18:25