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

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:
Hence , x=- 2 and y=- 1
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