Write Minors and Cofactors of the elements of following determinants:


Minor of an element aij = Mij �


a11 = a, Minor of element a11 = M11 = d


Here removing 1st row and 1st column from the determinant we are left out with d so M11 = d.


Similarly, finding other Minors of the determinant


a12 = c, Minor of element a12 = M12 = b


a21 = b, Minor of element a21 = M21 = c


a22 = d, Minor of element a22 = M22 = a


Cofactor of an element aij, Aij = (-1)i+j × Mij


A11 = (-1)1+1 × M11 = 1 × d = d


A12 = (-1)1+2 × M12 = (-1) × b = -b


A21 = (-1)2+1 × M11 = (-1) × c = -c


A22 = (-1)2+2 × M22 = 1 × a = a


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