If A and B are two matrices such that AB = B and BA = A, then \[{{A}^{2}}+{{B}^{2}}\] is equal to

If A and B are two matrices such that AB = B and BA = A, then \[{{A}^{

1.	If A and B are two matrices such that AB = B and BA = A, then \[{{A}^{2}}+{{B}^{2}}\] is equal to
A.	2AB
B.	2BA
C.	A+B
D.	AB
Answer» D. AB

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If A and B are two matrices such that AB = B and BA = A, then \[{{A}^{2}}+{{B}^{2}}\] is equal to

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