If the inverse of the matrix A=⎡⎢⎣1222−12221⎤⎥⎦ is 15� – InterviewSolution

1.	If the inverse of the matrix A=⎡⎢⎣1222−12221⎤⎥⎦ is 15⎡⎢⎣−3222−3α22−3⎤⎥⎦, then the value of α is
Answer» If the inverse of the matrix $A = ⎡ ⎢ ⎣ \begin{matrix} 1 & 2 & 2 2 & - 1 & 2 2 & 2 & 1 \end{matrix} ⎤ ⎥ ⎦$ is $\frac{1}{5} ⎡ ⎢ ⎣ \begin{matrix} - 3 & 2 & 2 2 & - 3 & α 2 & 2 & - 3 \end{matrix} ⎤ ⎥ ⎦$ , then the value of $α$ is

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