Find the inverse of the given matrix, or determine that the matrix is singular. (If the inverse doesn't exist, enter DNE in any cell of the matrix.) [ 1 8 7 ] [ 0 5 1 ] [ 0 0 1 ]
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Given matrix A: \[ A = \begin{pmatrix} 1 & 8 & 7 \\ 0 & 5 & 1 \\ 0 & 0 & 1 \end{pmatrix} \] The determinant of A is given by: \[ \text{det}(A) = 1(5 \times 1 - 0 \times 1) - 8(0 \times 1 - 0 \times 1) + 7(0 \times 0 - 0 \times 5) \] \[ \text{det}(A) = 5 \] Show more…
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