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Question
If A = `[(1,2), (1,3)]`, find A2 - 3A
Solution
A2 = A . A
= `[(1,2), (1,3)] [(1,2), (1,3)]`
= `[(3,8), (8,11)]`
A2 - 3A = `[(3,8), (4,11)] - [(3,6), (3,9)]`
= `[(0,2), (1,2)]`
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