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If A=[1-1 2 3],B=[2 1 1 0],p rov et h a...

If `A=[1-1 2 3],B=[2 1 1 0],p rov et h a t(A+B)^2!=A^2+2A B+B^2`

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`A=[[1,-1],[ 2, 3]],B=[[2 ,1],[ 1, 0]]`
`=A^2=[[1,-1],[ 2, 3]].[[1,-1],[ 2, 3]]`
`A^2=[[-1,7],[-4,7]]`
`B^2=[[2 ,1],[ 1, 0]].[[2 ,1],[ 1, 0]]`
=`[[5,2],[2,1]]`
`2AB=2[[1,-1],[ 2, 3]].[[2 ,1],[ 1, 0]]`
=`2[[1,7],[1,4]]`
=`[[2,14],[2,8]]`
...
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