Compute the Determinant of the Matrix by Cofactor Expansion $$\left[ \begin{array} { r r r } 1 & 2 & 5 \\4 & 8 & 12 \\- 2 & 3 & - 1\end{array} \right]$$

question 16

Multiple Choice

Compute the determinant of the matrix by cofactor expansion.
- $$\left[ \begin{array} { r r r } 1 & 2 & 5 \\4 & 8 & 12 \\- 2 & 3 & - 1\end{array} \right]$$

• A) 14
• B) 56
• C) \(- 28\)
• D) 28

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