The Total solution for NCERT class 6-12
(i) Let
A =
Therefore cofactors of A are
C11 = – 3
C21 = 2
C31 = 2
C12 = 2
C22 = – 3
C23 = 2
C13 = 2
C33 = – 3
(ii) Let
Cofactors of A
C11 = 2
C21 = 3
C31 = – 13
C12 = – 3
C22 = 6
C32 = 9
C13 = 5
C23 = – 3
C33 = – 1
(iii) Let
Therefore cofactors of A
C11 = – 22
C21 = 11
C31 = – 11
C12 = 4
C22 = – 2
C32 = 2
C13 = 16
C23 = – 8
C33 = 8
(iv) Let
C11 = 3
C21 = – 1
C31 = 1
C12 = – 15
C22 = 7
C32 = – 5
C13 = 4
C23 = – 2
C33 = 2