Which matrix is the inverse of (1021)\begin{pmatrix} 1 & 0 \\ 2 & 1 \end{pmatrix}(1201)?
(10−21)\begin{pmatrix} 1 & 0 \\ -2 & 1 \end{pmatrix}(1−201)
(1021)\begin{pmatrix} 1 & 0 \\ 2 & 1 \end{pmatrix}(1201)
(−102−1)\begin{pmatrix} -1 & 0 \\ 2 & -1 \end{pmatrix}(−120−1)
(1201)\begin{pmatrix} 1 & 2 \\ 0 & 1 \end{pmatrix}(1021)