(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

1 1 1 | 2

0 5 2 | 12

0 -4 8 | 0

Answer:

100 | -3

010 | 2

001 | 1

2. Relevant equations

3. The attempt at a solution

How did they get the answer? I went over how to do 2x2 w/ someone but 3x3 seems different.

Basically this is how I'm thinking to do it:

Find position 1 which is 1 so don't do anything.

Go to position 2 which is 0, so good.

Go to three 0, so good.

Go to position 4, which is 5. Multiply the entire row with that 5 by the reciprocol of 5 (1/5).

Go to position 5 which is -4, needs to be 0. Multiply the first row by 4 then add that result to the row with the 4 in it. So basically: 4(Row1) + Row2 -> New Row 2

Then pretty much repeat with 8, then 2, then 1, then 1...remembering that

1. To get a 1, multiply by the reciprocal.

2. To get a 0 in row 2 in a position that has a 3, for example: -3(row 1) + row 2 => row 2

I'm not getting the right answer though. D:

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Matrix Redux

**Physics Forums | Science Articles, Homework Help, Discussion**