- #1
Rob K
- 33
- 0
This is insane, I am trying to revise the inverse of matrices and this one element is being really stubborn, please help.
Here is the matrix
3 -1 7
2 0 1
5 -2 6
I have transposed it
3 2 5
-1 0 -2
7 1 6
Now as for replacing the element of the co factors, I am stuck on the second one on the first row.
I have calculated the co factor to be as follows:
(-1 * 6) - (-2 * 7) = 8
fine
but now you times it by the place sign, which is a minus is it not?
So this gives me -8
the book disagrees
And to my horror so does Matlab.
Where am I going wrong?
An help would be appreciated, as I simply can't see where I am going wrong.
Kind regards
Rob
Here is the matrix
3 -1 7
2 0 1
5 -2 6
I have transposed it
3 2 5
-1 0 -2
7 1 6
Now as for replacing the element of the co factors, I am stuck on the second one on the first row.
I have calculated the co factor to be as follows:
(-1 * 6) - (-2 * 7) = 8
fine
but now you times it by the place sign, which is a minus is it not?
So this gives me -8
the book disagrees
And to my horror so does Matlab.
Where am I going wrong?
An help would be appreciated, as I simply can't see where I am going wrong.
Kind regards
Rob