- 104

- 4

1 1 2 8

-1 -2 3 1

3 -7 4 10

and so far I have:

1 1 2 8

0 10 -50 -90

0 0 -52 -104

I was just wondering if I was required to put another zero in my third row. Am I always required to have three zeros in the third row? I'm assuming I do, but when I looked at the solution for this problem I found it to be:

1 1 2 8

0 1 -5 -9

0 0 1 2

However this solution does not have three zeros in the third row, when all of the other problems and solutions did have three zeros.

My apologies for the misaligned matrix, I am still getting used to Physics Forum.

Thank you.