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If A=({:(1,2),(2,3):}) and A^(2) -KA-I(2...

If `A=({:(1,2),(2,3):}) and A^(2) -KA-I_(2)=O," where "I_(2)` is the `2xx2` identitiy matrix, then what is the value of k ?

A

4

B

-4

C

8

D

-8

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