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$If A = [\begin{array}{ccc} - 1 & - 2 & - 2 \\ 2 & 1 & - 2 \\ 2 & - 2 & 1 \end{array}], Adj A = x A^{T}, then x =$

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Correct option is D

Cofactor of −111 is A11=(−1)1+11−2−21A11=1−4A11=−3 Given that Adj⁡A=3AT−3=x(−1)x=3

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If A=−1−2−221−22−21, Adj A=xAT, then x=

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$If A = [\begin{array}{ccc} - 1 & - 2 & - 2 \\ 2 & 1 & - 2 \\ 2 & - 2 & 1 \end{array}], Adj A = x A^{T}, then x =$