Solving (3) and (4), we get b = – 110,
d = 44 Rationalised 2023-24
 72
MATHEMATICS
Therefore
D =
191
110
77
44
a
b
c
d
−
−




=








Miscellaneous Exercise on Chapter 3
1 If A and B are symmetric matrices, prove that AB – BA is a skew symmetric
matrix 2