Compute the indicated products
`[(1, -2),(2,3)][(1,2,3),(2,3,1)]`
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Solution
`[(1, -2),(2,3)][(1,2,3),(2,3,1)]`
`=[(1(1)-2(2), 1(2)-2(3), 1(3)-2(1)), (2(1)+3(2), 2(2)+3(3), 2(3)+3(1))]`
`= [(1-4, 2-6, 3-2),(2+6, 4+9, 6+3)] = [(-3, -4, 1),(8 ,13,9)]`
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