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Find [[1,2],[3,4]] * [[2,-1],[-1,2]]

Solution:
Your problem `->` [[1,2],[3,4]] * [[2,-1],[-1,2]]


`A×B`=
`1``2`
`3``4`
×
`2``-1`
`-1``2`


=
`1×2+2×-1``1×-1+2×2`
`3×2+4×-1``3×-1+4×2`


=
`2-2``-1+4`
`6-4``-3+8`


=
`0``3`
`2``5`







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