Question: Prove that, if row 2 of a 3 by 3 determinant is multiplied by k, k 0 and the result is added to the entries

Prove that, if row 2 of a 3 by 3 determinant is multiplied by k, k ≠0 and the result is added to the entries in row 1, there is no change in the value of the determinant.

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