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For the matrix A=[{:(3,2),(1,1):}], find...

For the matrix `A=[{:(3,2),(1,1):}]`, find the numbers a and b such that `A^(2)+aA+bI=0`. Hence find `A^(-1)`.

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The correct Answer is:
`a=-4`, `b=1`; `[{:(1,-2),(-1,3):}]`
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