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If A = [[2,1],[3,0]] find a and b such t...

If `A = [[2,1],[3,0]]` find a and b such that `A^(2)+aA+bl_(2)=0` Hence, find `A^(-1)`.

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The correct Answer is:
`A^(-1)=[[0,(1)/(3)],[1,-(2)/(3)]]`
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