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Determinant n

  • Thread starter Helloes
  • Start date
  • #1
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0

Homework Statement


I have to find a determinant for
1 2 3 ... n
-1 0 3 ... n
-1 -2 0 ... n
................
-1 -2 -3 ... 0
but I have very little clue how to proceed, because the mathematics material that I was given is very vague about this. Any help would be greatly appreciated.


Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
1,198
5
Does -1 -2 -3 ... 0 represent the final row of the matrix meaning the the lowest right member is 0?
 
  • #3
I like Serena
Homework Helper
6,577
176
Welcome to PF, Helloes! :smile:

The main rule about calculating determinants, is that you can add a multiple of a row to another row, without changing the determinant.
Same thing for columns: you can add (or subtract) a multiple of one column to another column.

Now let's try a couple of determinants.

What is |1|?

What is [itex]\begin{vmatrix}1&2\\-1&0\end{vmatrix}[/itex]?

What is [itex]\begin{vmatrix}1&2&3\\-1&0&3\\-1&-2&0\end{vmatrix}[/itex]?

What is [itex]\begin{vmatrix}1&2&3&4\\-1&0&3&4\\-1&-2&0&4\\-1&-2&-3&0\end{vmatrix}[/itex]?
 

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