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If A = [(1,2,2),(2,1,-2),(a,2,b)] is a m...

If `A = [(1,2,2),(2,1,-2),(a,2,b)]` is a matrix satisfying `A A^(T) = 9I_(3)`, then the values of a and b are respectively A)1, 2 B)`-1, 2` C)`-1, -2` D)`-2, -1`

A

(2,-1)

B

(-2,1)

C

(2,1)

D

(-2,1)

Text Solution

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The correct Answer is:
D
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