00:01
We're being asked to find the inverse of this particular matrix.
00:03
It's a 2 by 2 matrix.
00:05
Well, remember, our general form for a 2 by 2 matrix would be, if these were all right items, a, b, c, d.
00:13
So to find the inverse, what we're going to do is we're going to do one over the determinant.
00:17
I'm going to call that d.
00:18
And then we're going to multiply that by d, negative b, negative c, and a.
00:25
So let's apply that to our example.
00:27
Well, first off, that means we have to find the determinant, which remember, ad minus b c...