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Question
If A = `[(2, -1, 1),(-2, 3, -2),(-4, 4, -3)]` the find A2
Solution
A2 = `[(2, -1, 1),(-2, 3, -2),(-4, 4, -3)] [(2, -1, 1),(-2, 3, -2),(-4, 4, -3)]`
= `[(4 + 2 - 4, -2 - 3 + 4, 2 + 2 - 3),(-4 - 6 + 8, 2 + 9 - 8, -2 - 6 + 6),(-8 - 8 + 12, 4 + 12 - 12, -4 - 8 + 9)]`
= `[(2, -1, 1),(-2, 3, -2),(-4, 4, -3)]`
= A
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