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Question
If A = `[(4, 8),(-2, -4)]`, prove that A2 = 0
Solution
A2 = A · A
= `[(4, 8),(-2, -4)] [(4, 8),(-2, -4)]`
= `[(16 - 16, 32 - 32),(-8 + 8, -16 + 16)]`
= `[(0, 0),(0, 0)]`
= 0.
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