Your answer is incorrect. Evaluate det(A) by a cofactor expansion along a row or column of your choice. $A = \begin{bmatrix} k+1 & k-1 & 4\\ 9 & k-1 & 3\\ 1 & k+1 & k \end{bmatrix}$ NOTE: Write your answer in terms of k. det(A) = $k^3 - 6k^2 + 37k + 40$
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