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If A is a matrix of size nxxn such that ...

If A is a matrix of size `nxxn` such that `A^(2) + A + 2I` = O then

A

A is non-singular

B

`A ne O`

C

|A| = O

D

`A^(-1) = (-1)/(2)(A + I)`

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The correct Answer is:
A, B, C, D
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