I'm a little confused how to do this homework problem, I can't seem to obtain the correct answer. I took my vectors v1, v2, and v3 and set up a matrix. So I made my matrix:
V = [ (6,0,0,1)T, (0,1,-1,0)T, (1,1,0,-6)T ] and then I had
u = [ (0,5,4,0) T ].
I then went to solve using least...