Home/Class 12/Maths/

Find minors and cofactors of all the elements of the determinant $$\left| {\begin{array}{*{20}{c}} 1&{ - 2} \\ 4&3 \end{array}} \right|$$
Speed
00:00
04:16

## QuestionMathsClass 12

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

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