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If A = [(1 2 2), (2 1 -2), (a 2 b)] is a matrix satisfying the equation AA^T = 9I,

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If A = [(1  2  2), (2  1  -2), (a  2  b)] is a matrix satisfying the equation AAT = 9I, where I is 3 x 3 identity matrix, then the ordered pair (a, b)is equal to

(a) (2, -1) 

(b) (-2, 1) 

(c) (2, 1)

(d) (-2, -1)

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Correct option (d) (-2, -1)

Explanation:

It is given that

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