Question
Use the determinant theorems to evaluate each determinant. See Example 4.$$\left|\begin{array}{lll}1 & 6 & 7 \\0 & 6 & 7 \\0 & 0 & 9\end{array}\right|$$
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An upper triangular matrix is a special kind of square matrix where all the entries below the main diagonal are zero. Show more…
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