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Find minors and cofactors of all the elements of the determinant \(\left| {\begin{array}{*{20}{c}} 1&{ - 2} \\ 4&3 \end{array}} \right|\)
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Find minors and cofactors of all the elements of the determinant \(\left| {\begin{array}{*{20}{c}} 1&{ - 2} \\ 4&3 \end{array}} \right|\)

Answer

\({M_{11}} = 3,{A_{11}} = 3\)
\({M_{12}} = 4,{A_{12}} = - 4\left[ {\because Aij = {{\left( { - 1} \right)}^{i + j}}.Mij} \right]\)
\({M_{21}} = - 2,{A_{21}} = 2\)
\({M_{22}} = 1,{A_{22}} = 1\)
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