# Thread: Matrix algebra subtraction- assist

1. ## Matrix algebra subtraction- assist

Hi guys i have a issue at the moment with a question. Its relatively easy but i dont know how to approach it. If you could help me that would be wonderful =)

So here's the question:

Matrix V is given as

0 5 3
7 8 0
4 3 2

Matrix X is given as:

2 5 3
4 8 0
0 3 2

and matrix H is given as:

1 1 0 0
2 0 5 3
4 7 8 0
0 4 3 2

Sorry about the matrix forms i dont know how to use the code to put it into is proper format -.-

The question then states that the determinant of H = determinant of V minus determinant of X, then find the determinant of H.

Im not too sure what the question is asking. Does anyone know how to approach it? Again guys, your contribution is greatly appreciated!!! Thanks again

2. If you look at the matrix H, matrices V and X are it's cofactors. The determinant of H is therefore as you have stated.

To notice this, follow the top row of H (this is the best row to take since it has the most number of 0's).

3. thanks man