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If A=[{:(1,2,2),(2,1,-2),(x,2,y):}] is a...

If `A=[{:(1,2,2),(2,1,-2),(x,2,y):}]` is a matrix satisfying AA=9I, then find the values of `x` and `y`.

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The correct Answer is:
`x=-2` and `y=-1`
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