Question-1 Then sum of the products of the elements of any row of a determinant A with the co-factors of the corresponding elements is equal to

Question-2 then A ^{12} is.

Question-3 and I is the unit matrix of order 2, then A^{2} equals

Question-4

Question-5 If A and B are any two matrices that AB = 0 and A is non- singular, then_________________.

Question-6 If f(x) = x^{2} - 5 x , A = , then f(A) is equal to

Question-7 for x ≠ 0, y ≠ 0, then D is

Question-8 If A and B are square matrices of the same order such that (A+B) (A-B) = A^{2} - B^{2} , then (ABA^{-1} )^{2} is equal to

Question-9 If A is a scalar matrix with scalar K = 10 of order 3, then A ^{-1} is______________.

Question-10 If A and B are two matrices such that AB =B and BA = A , then A ^{2} +B ^{2} =