Practice problem
What is A−1A^{-1}A−1?
[9−1−4−42−6−8−13]\begin{bmatrix} 9 & -1 & -4 \\ -4 & 2 & -6 \\ -8 & -1 & 3 \end{bmatrix}9−4−8−12−1−4−63
[11216−112−13312161413−512]\begin{bmatrix} \frac{1}{12} & \frac{1}{6} & -\frac{1}{12} \\ -\frac{1}{3} & \frac{3}{12} & \frac{1}{6} \\ \frac{1}{4} & \frac{1}{3} & -\frac{5}{12} \end{bmatrix}121−31416112331−12161−125
[13−114−1412−1618−119]\begin{bmatrix} \frac{1}{3} & -1 & \frac{1}{4} \\ -\frac{1}{4} & \frac{1}{2} & -\frac{1}{6} \\ \frac{1}{8} & -1 & \frac{1}{9} \end{bmatrix}31−4181−121−141−6191
[−31−44−26−81−9]\begin{bmatrix} -3 & 1 & -4 \\ 4 & -2 & 6 \\ -8 & 1 & -9 \end{bmatrix}−34−81−21−46−9
AAA is not invertible.
Type a concept, like “slope” or “photosynthesis”.