If A is an orthogonal matrix, then A -1 is equal to ___________.
A
A'
A2
None of these
A2 = B2
A + B = B-A
AB = BA
A-B = B-A
If 3 × + 2y = 1 and 2× - y = 0, where 1 and 0 are unit and null matrices of order 3, then
X = 1/7, y = 2/7
X = 2/7, y = 1/7
X = 1/7 I, y = 2/7 I
X= 2/7 I, Y = 1/7 I
If A = [aij]mxn is a square matrix if
m < n
m > n
m = n
-A
Null matrix
, then A2 is equal to
Unit matrix
- A
If A is a squre matrix, then A - A' is _____________.
A skew symmetric matrix
