# Thread: How do you find the find the determinant of 3x3 matrix ?

1. ## How do you find the find the determinant of 3x3 matrix ?

I was given this review problem but i dobnt remeber learning this :

find u • v x w (u dot v cross w).
in other words find the determinant of 3x3 matrix:
1 4 3
2 5 6
1 2 7

How would you do this ?

2. Originally Posted by nosh
I was given this review problem but i dobnt remeber learning this :

find u • v x w (u dot v cross w).
in other words find the determinant of 3x3 matrix:
1 4 3
2 5 6
1 2 7

How would you do this ?
see here

you may also want to see here

3. You may also be interested in the Rule of Sarrus : Rule of Sarrus - Wikipedia, the free encyclopedia
Once you've understood the picture on the right, you've understood the method.
And it's quite straightforward :P

4. Originally Posted by Moo
You may also be interested in the Rule of Sarrus : Rule of Sarrus - Wikipedia, the free encyclopedia
Once you've understood the picture on the right, you've understood the method.
And it's quite straightforward :P
i wanted to post a link to that method as well. but i never remembered what it was called. couldn't bother searching for it