If the value of x for which the matrixA=⎡⎢⎣2070101−21⎤⎥⎦ is the inverse of B=⎡⎢⎣−x14x7x010x−4x−2x⎤⎥⎦ is k, then 10k is

If the value of x for which the matrixA=⎡⎢⎣2070101−21⎤⎥⎦

1.	If the value of x for which the matrixA=⎡⎢⎣2070101−21⎤⎥⎦ is the inverse of B=⎡⎢⎣−x14x7x010x−4x−2x⎤⎥⎦ is k, then 10k is
Answer» If the value of $x$ for which the matrix $A = ⎡ ⎢ ⎣ \begin{matrix} 2 & 0 & 7 0 & 1 & 0 1 & - 2 & 1 \end{matrix} ⎤ ⎥ ⎦$ is the inverse of $B = ⎡ ⎢ ⎣ \begin{matrix} - x & 14 x & 7 x 0 & 1 & 0 x & - 4 x & - 2 x \end{matrix} ⎤ ⎥ ⎦$ is $k,$ then $10 k$ is