If A and B are two matrices such that \[AB=B\]and \[BA=A,\] then \[{{A}^{2}}+{{B}^{2}}=\] [EAMCET 1994]

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 \[{{A}^{2}}+{{B}^{2}}=\] [EAMCET 1994]
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 \[{{A}^{2}}+{{B}^{2}}=\] [EAMCET 1994]

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