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find the cofactor of a(23) in [(3,1,4),(...

find the cofactor of` a_(23)` in `[(3,1,4),(0,2,-1),(1,-3,5)]`

Text Solution

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Let `A=[(3,1,4),(0,2,-1),(1,-3,5)]`
`therefore" cofactor of" " "a_(23) =-D`
where `D=|(3,1),(1,-3)|`
[after crossing the 2nd row and 3rd column]
`=-9-1=-10`
Hence, cofactor of `a_(23)=-(-10)=10`
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