00:01
Given a 3x3 matrix like this, we know that there are three factorial terms, which means there's six terms.
00:09
When you have a 3 by 3 matrix, there's a trick where you take, the trick to find the determinant, where you take the first two columns and write them to the right of the matrix.
00:19
So we 5 -0, 03, and 2 -0.
00:23
And now what you do is you just look diagonally and you find three terms you're going to add and three you're going to subtract.
00:30
So here's one we add.
00:31
So we're going to multiply the values in these ovals.
00:35
So those will all be summed.
00:38
And then we also have three values we're going to subtract here.
00:42
So that's 1 minus, 2 minus 3 minus...