This is the question i am trying to solve...
U is a 3x3 matrix.
However, when i put my answer in I get only part marks... 78% right.
I found that to get B, I had to use elementary row operations. Mine were:
-2r1 + r2 --> r2
and r1 + r3 --> r3
after that I used an identity to find U, and i applied the same row operations.
My matrix/U looked like this after:
1 0 0
-2 1 0
1 0 1
What am i doing wrong???
I just figured it out...
I just had to invert U to get my answer