" 39.If "|A|=2," where "A" is "2times2" matrix,find "|" ad "jA|

If |A|=2 , where A is 2xx2 matrix, find |a d j\ A| .

If |A|=2 , where A is 2xx2 matrix, find |a d j\ A| .

A=[[0,1],[3,0]]" and let "BV=[[0],[11]]" Where "B=A^(8)+A^6+A^(4)+A^(2)+I," (Where "I" is the "2times2" identity matrix) then the product of all elements of matrix "V" is "

If [[1 ,0],[y,5]]+2[[x,0], [1,-2]]=I , where I is 2xx2 unit matrix. Find x and y .

Find all solutions of the matrix equation X^2=1, where 1 is the 2*2 unit matrix, and X is a real matrix,i.e. a matrix all of whose elements are real.