SOLUTION: I am having trouble finding the determinant on a 4x4 matrix/Triangular Form. Please explain... 4 0 3 -2 3 1 2 -1 1 -6 -2 2 D = 39 2 2 0 -1 I tried exchanging

Question 47751: I am having trouble finding the determinant on a 4x4 matrix/Triangular Form. Please explain...
4 0 3 -2
3 1 2 -1
1 -6 -2 2 D = 39
2 2 0 -1
I tried exchanging Rows 3 and 4 over 1 and 2 but I can't get the 39. What should I remember when dealing with this form? Thanks a lot.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
That depends on what you have learned.
I would suggest you expand the determinant
by minors; then do the arithmetic on the
resulting 3 by 3 determinants.
Have you learned how to do that?
39 is the correct answer.
Cheers,
Stan H.
RELATED QUESTIONS
Hi all, I'm having trouble finding the determinant of the following matrix A. Let Matrix (answered by mathmontrealmath)

I am having trouble finding the determinant of the matrix [-1 2] [1 3] with the 1 and 3... (answered by venugopalramana,jim_thompson5910)

Finding the determinant of the matrix, if it exists. [3/2 1] [-1... (answered by ikleyn)

find the determinant of the matrix A=(9 6 2 1 2 3 4 5... (answered by Alan3354)

I HAVING TROUBLE FINDING THE INVERSE OF THESE MATRIX. 2 3 3 5 1 -2 2 -5 (answered by Fombitz)

I have to solve a 4X4 matrix w x y z 2 -2 -2 2 10 1 1 1 1 -5 3 1 -1 4 -2 1 (answered by vidyamanohar)

what is the determinant of the matrix B= 6 6 2 1 4 3 7 3 6 5 3 0 6 3 0 7... (answered by Fombitz)

3� + 4(-1 - 2) - 25 I am having trouble finding the answer. I came up with... (answered by mananth,MathLover1)

I need your help on these three problems.................... (1). -4 5 -5 The... (answered by xcentaur)