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If A=[2-1 3 1] and B=[1 4 7 2] , find 3A...

If `A=[2-1 3 1]` and `B=[1 4 7 2]` , find `3A-2Bdot`

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`3A-2B=3 [(2,-1),(3,1)]-2[(1,4),(7,2)]`
`=[(6,-3),(9,3)]-[(2,8),(14,4)]`
`=[(6-2, -3-8),(9-14,3-4)]`
`=[(4,-11),(-5,-1)]`
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