1/5
1/4
1/3
1/2
then AB =
[ -2 -1 4 ]
If A is a square matrix, then
AA' is symmetric
AA' is skew symmetric
A'A is skew symmetric
None of these
skew symmetric matrix
symmetric matrix
diagonal matrix
upper triangular matrix
Diagonal
Upper triangular
Scalar
Skew symmetric
All diagonal elements of skew symmetric matrix are
distinct
0
1
Some zero and some non-zero
If matrix A is such that 2A2 + 5A + I = 0. The inverse of A is
-[2A+5I]
[2A+5I]
2A2+5A
5A+I
then 3A - 4B =
If A and B are two matrices and ( A + B ) ( A - B ) = A2 - B2 , then
AB = BA
A2 + B2 = A2 - B2
A' B' = AB
B1A1 = AB
