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Given that the matrix $A=\begin{bmatrix} a_{11} &a_{12} \\ a_{21} &a_{22} \end{bmatrix}$ and Eigen value are $1,-2$ and Corresponding Eigen Vectors are $X_{1}=\begin{bmatrix} 1\\2 \end{bmatrix}$ and  $X_{2}=\begin{bmatrix} 9\\1 \end{bmatrix}$

Find the $1)\sum a_{ij},$when $i=j$

             $2)Det(A)$

             $3)$Sum of all Elements in the given matrix

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