1. Find an LU factorization of the matrix A (with L unit lower triangular). -5 0 2 15 3-2 15 12 18 A=
2. Compute the determinant by cofactor expansion. At each step, choose row or column that involves the least amount of computation. 3 6 -9 0-2 4 0 0 1 0 0 0 2 -6 7 2
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