Question

a=abc b c a fc aЬ cofactor of is ca?​

Answer 1

Answer:

B

ac−b

2

By property of co-factor of matrix(2),

cofactor of a

ij

=M

ij

×(−1)

i+j

∴ minor of a

21

=

∣

∣

∣

∣

∣

∣

a

12

a

32

a

13

a

33

∣

∣

∣

∣

∣

∣

=

∣

∣

∣

∣

∣

∣

b

a

c

b

∣

∣

∣

∣

∣

∣

M

21

=b

2

−ac

So, co factor of a

21

=M

21

×(−1)

1+2

=−M

21

=ac−b

2