[Solution] Find the determinant of B by using elementary row operations. Clearly state the answer and show all work.


Question: Find the determinant of \(\mathrm{B}\) by using elementary row operations. Clearly state the answer and show all work.

\[B=\left[\begin{array}{cccc} 9 & -4 & 2 & 5 \\ 2 & 7 & 6 & -5 \\ 4 & 1 & -2 & 0 \\ 7 & 3 & 4 & 10 \end{array}\right]\]

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