- #1
mexion
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Homework Statement
so my problem is to calculate the determinant of this matrix
[tex]\left[\begin{array}{ccccc}
1 & 2 & 3 & 3 & 5 \\
3 & 2 & 1 & 2 & 2 \\
1 & 2 & 3 & 4 & 5 \\
-1 & 0 & -8 & 1 & 2 \\
7 & 2 & 1 & 3 & 2
\end{array}\right][/tex]
Homework Equations
The Attempt at a Solution
my calculation -> http://img29.imageshack.us/img29/1120/21102009124.th.jpg
i know to use Laplace, but my teacher said me "at first you should reduce matrix to 3x3 or even 2x2 - it's easier to calculate the determinant"
but i don't understand this methode at all.
i've done this problem and my solution is -379 and i know it's wrong (correct is -224)
please help.
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