Write the minors and cofactors of each element of the first column of the following matrices and hence evaluate the determinant in each case: `A=[5 20 0-1]` (ii) `A=[-1 4 2 3]` (iii) `A=[1-3 2 4-1 2 3 5 2]` (iv) `A=[1a b c1b c a1c a b]`

Explanation

(i) `A=[(5, 20),( 0,-1)]`

Then

`M_(11)=-1`

`M_(21)=20`

`C_(11)=(-1)^2 M_(11)=-1`

`C_(21)=(-1)^3 M_(21)=-20`

Then

`|A|= a_(11) c_(11)+a_(21) c_(21)`

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