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Find the value of the determinant.

211472240\left|\begin{array}{rrr}2 & 1 & -1 \\ 4 & 7 & -2 \\ 2 & 4 & 0\end{array}\right|


Answered 2 years ago
Answered 2 years ago
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To find the determinant of a 3×33\times 3 matrix, we can multiply each element in, for example, first row, by its cofactor. The sum of those products will give us the needed value of the determinant.

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