Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) If `A=[[1,2,2],[2,1,-2],[a,2,b]]` is a matrix satisfying the equation `text(A)A^T =9I`, where `I` is 3x3 identity matrix, then the ordered pair (a,b) is equal to - Sarthaks eConnect
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If `A=[[1,2,2],[2,1,-2],[a,2,b]]` is a matrix satisfying the equation `text(A)A^T =9I`, where `I` is 3x3 identity matrix, then the ordered pair (a,b) is equal to

A.

(2, -1)

B.

(-2, 1)

C.

(2, 1)

D.

(-2, -1)