Suppose A is a 2 X 2 matrix with real number entries such that AB=BA for all 2 X 2 matrices. What relationships must exist among the entries of A ?

Name: Suppose A is a 2 X 2 matrix with real number entries such that AB=BA for all 2 X 2 matrices. What relationships must exist among the entries of A ?
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Question

Suppose  A  is a  2 X 2  matrix with real number entries such that  AB=BA  for all  2 X 2  matrices. What relationships must exist among the entries of  A  ?

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The Answer of Suppose  A  is a  2 X 2  matrix with real number entries such that  AB=BA  for all  2 X 2  matrices. What relationships must exist among the entries of  A  ?

Suppose a Is a 2 X 2