If A=[\table 1,2,2;2,1,-2;a,2,b] is a matrix satisfying the equation AA^T=9I, where I is 3\times3 identity matrix, thenordered pair (a, b) is equal to : [Main 2015]

Correct Answer is : (−2,−1)

JEE Main 2015 Question Paper

Section: Mathematics

Question : 55 of 90

Marks: +1, -0

If A=[

] is a matrix satisfying the equation AAT=9I, where I is 3×3 identity matrix, thenordered pair (a, b) is equal to :

[Main 2015]

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