cofactor of element ‘b’ in the matrix $$abc247$$−$$103is$$

Cofactor of $$b=$$−$$11+227$$−$$13=$$−$$13$$

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Question

cofactor of element ‘b’ in the matrix $[\begin{matrix} a & b & c \\ 2 & 4 & 7 \\ - 1 & 0 & 3 \end{matrix}]$ is

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Solution

$C o f a c t o r o f b = {(- 1)}^{1 + 2} |\begin{matrix} 2 & 7 \\ - 1 & 3 \end{matrix}| = - (13)$

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