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If A=[(2, 2),(9,4)] and A^(2)+aA+bI=O. T...

If `A=[(2, 2),(9,4)]` and `A^(2)+aA+bI=O`. Then `a+2b` is equal to (where, I is an identity matrix and O is a null matrix of order 2 respectively)

A

27

B

`-26`

C

24

D

12

Text Solution

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The correct Answer is:
B
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