Question

If someone could help me with this, I would appreciate it! Thanks!

Directions: Determine if these two are inverses of one another.

A= [ 1 1 1
3 5 4
0 -1 0]

A^-1= [ 4 -1 -1
0 0 -1
-3 1 2]

Answer 1

well, just multiply them. If you get the identity matrix, they are inverses

Looks like we have a winner!

http://www.wolframalpha.com/input/?i=%7B%7B1%2C1%2C1%7D%2C%7B3%2C5%2C4%7D%2C%7B0%2C-1%2C0%7D%7D*%7B%7B4%2C-1%2C-1%7D%2C%7B0%2C0%2C-1%7D%2C%7B-3%2C1%2C2%7D%7D