Test Academy | If A = [ 10 2 k + 5 3 k − 3 k + 5 ] is a symmetric matrix, the value of k is ______

Question

If A = $[\begin{matrix} 10 & 2 k + 5 \\ 3 k - 3 & k + 5 \end{matrix}]$ is a symmetric matrix, the value of k is _______.

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