The expansion of a 3x3 determinant can be remembered by this device. Write a second copy of the first two columns to the right of the matrix, and compute the determinant by multiplying entries on six...

Extracted text: The expansion of a 3x3 determinant can be remembered by this device. Write a second copy of the first two columns to the right of the matrix, and compute the determinant by multiplying entries on six diagonals. Add the downward diagonal products and subtract the upward products. Use this method to compute the following determinant. Га11 а12 а13] a11 а12 -2 4 a21 a22 a23 a2í a22 0 2 -1 -5 3 2 a31 a32 a33 a31 a32 ..... -2 4 0 2 - 1 -5 3 2 II