Q.If $A = \begin{pmatrix} 1 & 2 & 2 \ 2 & 1 & -2 \ a & 2 & b \end{pmatrix}$ is a matrix satisfying $A \text{adj } A = 49 I$ , then $a + b$ equals

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Q.If A=(122 21−2 a2b)A = \begin{pmatrix} 1 & 2 & 2 \ 2 & 1 & -2 \ a & 2 & b \end{pmatrix}A=(1​2​2 2​1​−2 a​2​b​) is a matrix satisfying Aadj A=49IA \text{adj } A = 49 IAadj A=49I, then a+ba + ba+b equals