If A= [ ccc 1 & 2 & 2 2 & 1 & -2 a & 2 & b ] is a matrix satisfyi… - Vidyadip

MCQ

If $A=\left[\begin{array}{ccc}1 & 2 & 2 \\ 2 & 1 & -2 \\ a & 2 & b\end{array}\right]$ is a matrix satisfying the equation $\mathrm{AA}^{\top}=9 I_{\mathrm{s}}$ where $\mathrm{I}$ is the identity

matrix of order 3, then the ordered pair (a, b) is equal to ___________

A
(2, -1)
B
(-2, 1)
C
(2, 1)
✓
(-2, -1)

✓

Answer

Correct option: D.

(-2, -1)

(-2, -1)

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