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04-01-2024
Mathematics

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Given a 3 × 3 matrix a and det(si−a)=s³ 2s² s1, which of the following is an expression for a³ in terms of i, a, and a²?
a) i−3a+2a²
b) i+3a−2a²
c) i+3a+2a²
d) i−3a−2a²

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