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If A=[[1, 1,-2],[ 2, 1,-3],[ 5, 4,-9]]. ...

If `A=[[1, 1,-2],[ 2, 1,-3],[ 5, 4,-9]]`. Find `|A|`.

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To find the determinant of the matrix \( A = \begin{bmatrix} 1 & 1 & -2 \\ 2 & 1 & -3 \\ 5 & 4 & -9 \end{bmatrix} \), we can follow these steps: ### Step 1: Write down the determinant We write the determinant of matrix \( A \): \[ |A| = \begin{vmatrix} 1 & 1 & -2 \\ 2 & 1 & -3 \\ 5 & 4 & -9 \end{vmatrix} \] ...
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