Mathematics, 30.11.2021 14:00 dreyes439

Let B be the 3×3 matrix containing the cofactors, with each entry multiplied by the appropriate ± sign. That is, the ij-entry of B is (−1)i+j det(Mij ). Compute A·BT. You should get a diagonal matrix with the same number in every diagonal entry. In other words, a multiple of the identity matrix. What multiple is it (in terms of A)?

Let B be the 3×3 matrix containing the cofactors, with each entry multiplied by the appropriate ± s

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