Practice problem
Find the inverse (A−1A^{-1}A−1) of matrix AAA: A=[72−19]A = \begin{bmatrix} 7 & 2 \\ -1 & 9 \end{bmatrix}A=[7−129]
A−1=[−265965765165]A^{-1} = \begin{bmatrix} -\frac{2}{65} & \frac{9}{65} \\ \frac{7}{65} & \frac{1}{65} \end{bmatrix}A−1=[−652657659651]
A−1=[965−265165765]A^{-1} = \begin{bmatrix} \frac{9}{65} & -\frac{2}{65} \\ \frac{1}{65} & \frac{7}{65} \end{bmatrix}A−1=[659651−652657]
A−1=[−965265−165−765]A^{-1} = \begin{bmatrix} -\frac{9}{65} & \frac{2}{65} \\ -\frac{1}{65} & -\frac{7}{65} \end{bmatrix}A−1=[−659−651652−657]
No Inverse
Type a concept, like “slope” or “photosynthesis”.