Question

find the cofactor of the following
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Answer 1

Step-by-step explanation:

cofactor of 1=( -1)power i+ j multiplied by its minor

its minor is det 1 3

3 5

its minor is obtained by closing its row and column

i represents row and j represents column

here 1 is in first row and first column

: . cofactor of 1 is (-1) power 1+1 into det of 1 3

3 5

=(-1) square into (5-9)

= -4 determinant of a matrix is ad- bc where the matrix is a b

c d

you can find remaining by using above information

hope you got it