Practice problem
Find the inverse (A−1A^{-1}A−1) of matrix A:
A=[7764]A = \begin{bmatrix} 7 & 7 \\ 6 & 4 \end{bmatrix}A=[7674]
A−1=[4−7−67]A^{-1} = \begin{bmatrix} 4 & -7 \\ -6 & 7 \end{bmatrix}A−1=[4−6−77]
A−1=[−271237−12]A^{-1} = \begin{bmatrix} -\frac{2}{7} & \frac{1}{2} \\ \frac{3}{7} & -\frac{1}{2} \end{bmatrix}A−1=[−727321−21]
A−1=[12−27−1237]A^{-1} = \begin{bmatrix} \frac{1}{2} & -\frac{2}{7} \\ -\frac{1}{2} & \frac{3}{7} \end{bmatrix}A−1=[21−21−7273]
No Inverse
Type a concept, like “slope” or “photosynthesis”.