If A and B are two matrices such that AB =B and BA = A , then A2+B2=
2AB
2BA
A+B
AB
and I is the unit matrix of order 2, then A2 equals
4 A - 3 I
3 A - 4 I
A- I
A + I
then A12 is.
Let the determinant of a 3 × 3 matrix A be 6, then B is a matrix defined by B = 5 A2, then, determinant of B is
180
100
80
none of these
14
None of these
a ( x + y + z )
0
abc + xyz + pqr
a ( x + y + z ) + b ( p + q + r ) + c
, then trace of matrix A is
17
25
3
12
If A is a square matrix, A' is its transpose, then 1/2 ( A-A' ) is
a symmetric matrix
skew symmetric matrix
a unit matrix
an elementary matrix
, then UV +XY =
[20]
20
[-20]
-20
Inverse of is.