I'm asked to multiply trace matrices, and then subtract them. I'm not sure the order I need to do the questions in. Can somebody help me here?

tr(BA)-tr(B)tr(A)

Where A=

3 -2 7

6 5 4

0 4 9

and B=

6 -2 4

0 1 3

7 7 5

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- October 6th 2008, 07:11 PMHellreaverMultiplying Matrices
I'm asked to multiply trace matrices, and then subtract them. I'm not sure the order I need to do the questions in. Can somebody help me here?

tr(BA)-tr(B)tr(A)

Where A=

3 -2 7

6 5 4

0 4 9

and B=

6 -2 4

0 1 3

7 7 5 - October 6th 2008, 07:16 PMThePerfectHacker
- October 6th 2008, 08:00 PMHellreaver
I got -66 as the answer.. Is this correct?

tr(BA)= 138

tr(A)tr(B)= 204