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2 1 8 When calculating the determinant of the matrix P = [7 3 9] , we can expand along its first row: 4 6

2 1 8 When calculating the determinant of the matrix P = [7 3 9] , we can expand along its first row: 4 6 3 2 +8 Simplifying, this becomes: 2(D11(D)+8{D) And finally we have: [P] = |:]

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