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If `A=[[1,-1],[ 2, 1]],B=[[a,1],[b,-1]]a n d(A+B)^2=A^2+B^2+2A B ,t h e n` a.`a=-1` b. `a=1` c. `b=2` d. `b=-2`

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CENGAGE PUBLICATION-MATRICES-All Questions
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  3. If A=[[1,-1],[ 2, 1]],B=[[a,1],[b,-1]]a n d(A+B)^2=A^2+B^2+2A B ,t h e...

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