>> Any rate, let's see we start with 2, 5, 1, 3 and now the identity matrix elements are 1, 0, 0, 1 and now my intention is to work through and cause these entries to be 1, 0, 0, 1 and the then the entries over here will be A inverse. Let's see if that's not the case. Now we're not trying to solve this in anyway, you know when we use this, the techniques involving matrices before we were solving a system of equations and accomplishing a certain kind of form, we're not doing that at all. We're, we're just manipulating to accomplish a certain pattern here and that pattern is right here. All of our concentration is right here, we don't care what happens over there. Alright, we want to make this element become a 1 and we just, we just kind of play these off of one another. I'm going to take a little bit slow here. I'm just kind of multiply here by -2, so it's -2 times row 1 and I'm creating a situation where we have a relative difference of, of 1 and also a sign change here between these two. So -2 times 2 is -4, -2 times 1 is -2, -2 times 1 is -2, -2 times 0 is 0 and then I'll just bring down this, this other, this next row, see and I have this. Okay, now what I'll do is add these two and put the result here. So I'm just taking row two and adding row one and the result is here, -4 with 5 is 1, 3 with -2 is 1, 0 with -2 is -2, 1 with 0 is 1. Okay, now I'll just bring down the 5, 3, 0, 1. Now think about what we need to do in order to accomplish a 0 right here. Well we'll play these two off of one another. So it's going to end up being, we'll I'm going to go low here, but let's see here, I think I can get one more step in. So here's what I'm doing, I'm bringing this down, the top one and for this row I'm multiplying -5 times row 1 and adding row 2, so -5 times 1 plus 5 is 0 as expected, -5 times 1 is -5 + 3 is -2, then -5 times -2 is 10 with 0 is 10. -5 times 1 is -5 + 1 is -4. Okay, so I have this. Now at this point, now notice that I have entries that are all even through here, so I can if I want to accomplish a one in this position and that's the next thing I want to do. I'll just divide here by -2, I'm going to put the result up there in just a moment, but we're not going to be able to refer back to this, so understand what we're going to have, we're going to divide here by -2 to give us a 1. We divide here by -2 to get -5, we divide here by -2 to give us 2. Okay, that's we are going to do in the next step. Let's go up here and do that. So I'm going to write then just kind of bring over a top line, you can't see it here probably, but just brining it over and then as I bring these over, I'm doing this, I'm taking row two and I'm dividing by -2. So I have 0, 1, negative 5, 2. Now the last thing I need to do is cause that rascal to be at 0...