Find the minor and cofactor of element '5' in 10−23−12456

The element ‘5’ is in 3rd row 2nd column elementMinor of 5=M32=1−232=8Cofactor of 5=A32=(−1)3+2M32=−8

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Find the minor and cofactor of element '5' in $[\begin{array}{ccc} 1 & 0 & - 2 \\ 3 & - 1 & 2 \\ 4 & 5 & 6 \end{array}]$

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The element ‘5’ is in $3^{r d}$ row $2^{n d}$ column element

Minor of $5 = M_{32} = |\begin{array}{cc} 1 & - 2 \\ 3 & 2 \end{array}| = 8$

Cofactor of $5 = A^{32}$ $= (- 1)^{3 + 2} M^{32} = - 8$

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