Decide whether or not the matrices are inverses of each other.
-$$\left[ \begin{array} { r r r }
1 & - 1 & 2 \
- 3 & - 2 & 4 \
- 1 & 1 & 1
\end{array} \right] \text { and } \left[ \begin{array} { r r r }
2 & - 1 & 0 \
- 1 & 1 & - 2 \
1 & 0 & - 1
\end{array} \right]$$
A) $Y e s$
B) No

Question

Decide whether or not the matrices are inverses of each other.
-$$\left[ \begin{array} { r r r } 
1 & - 1 & 2 \
- 3 & - 2 & 4 \
- 1 & 1 & 1
\end{array} \right] \text { and } \left[ \begin{array} { r r r } 
2 & - 1 & 0 \
- 1 & 1 & - 2 \
1 & 0 & - 1
\end{array} \right]$$
A) $Y e s$
B) No

Quizplus · Accepted Answer

The product of the two matrices is not the identity matrix, so they are not inverses of each other.

Decide Whether or Not the Matrices Are Inverses of Each