Link to the classroom item you are referring to:

I hope I don’t completely embarrass myself now but doesn’t the matrix at 4:25 in the video show a **row echolon** form and **NOT** a **reduced echolon form**?

At least given my understanding of the criterias of a reduced echolon form:

- It is in row echelon form.
- The leading entry in each nonzero row is 1.
- Each column containing a leading 1 has zeros in all its other entries.