- #1
wakko101
- 68
- 0
The question I'm dealing with is this:
Suppose adj(A) =
-1 2 -4
0 -3 0
0 0 3
Find A
I was trying to figure it out backwards, by using a 3x3 matrix of variables and doing the cofactor expansion thing and then seeing if I could figure out the values of the variables, but I'm not sure that's the way to go. I suspect there is a formula or theorem out there that will help me, but I can't figure out what it is.
Any help?
Suppose adj(A) =
-1 2 -4
0 -3 0
0 0 3
Find A
I was trying to figure it out backwards, by using a 3x3 matrix of variables and doing the cofactor expansion thing and then seeing if I could figure out the values of the variables, but I'm not sure that's the way to go. I suspect there is a formula or theorem out there that will help me, but I can't figure out what it is.
Any help?