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**coolwind****Member**- Registered: 2005-10-30
- Posts: 30

Suppose that A ia an nXn matrix that satisfies A^2+7A-I=0.Then A is invertible??

ture or false??and why??

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**Alg Num Theory****Member**- Registered: 2017-11-24
- Posts: 693
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Me, or the ugly man, whatever (3,3,6)

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