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Question
Find |AB| if A = `[(3,-1),(2,1)]` and B = `[(3,0),(1,-2)]`
Solution
AB = `[(3,-1),(2,1)] [(3,0),(1,-2)]`
`= [(9 - 1, 0 + 2),(6 + 1, 0 - 2)] = [(8,2),(7,-2)]`
∴ |AB| = `|(8,2),(7,-2)|`
= - 16 - 14
= - 30
∴ |AB| = - 30
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