If A is an invertible 22 matrix and B is any 22 matrix,
Chapter 2, Problem 60(choose chapter or problem)
If A is an invertible 22 matrix and B is any 22 matrix, then the formula rref(AB) = rref(B) must hold.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer