Math 1090
Quiz 17
24 February, 2012
Name:
Instructions: Answer the questions below. Make sure to show all work
clearly.
1. (5 points) Are the following matrices inverses?




2
3 −1
1 −1 1
1
0
A= 0
B = −1 1 0
−1 −2 1
1
1 2
Note: If it takes you more space than this, you’re doing more work than you need to.
2. (5 points) Find the inverse of:
4 −1
C=
−2 1