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Math Help - Determinant of matrix

  1. #1
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    Determinant of matrix


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    Is this a 3 by 4 matrix? I know how to find the determinant of a 3 by 3 matrix. How is the determinant calculated for this matrix?
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  2. #2
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    You would be trying to evaluate \displaystyle \left|\begin{matrix}1 & 2 & \phantom{a}-1\\ a & 3 & \phantom{a -}1\\ 2 & 1 & a - 1\end{matrix}\right|
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