00:01
Here on this problem, we are given a is the matrix 4 -8, and b is the matrix negative 3.
00:13
Now, we want to find two products here.
00:15
We want to find the matrix a -b, and then we want to find the matrix b.
00:21
Now, any time you're going to multiply matrices, i like to write them out next to each other.
00:24
Order matters with matrices.
00:27
And so if you write them out next to each other, it does help reinforce what order you're actually going to go in.
00:33
And then we multiply rows by columns.
00:39
And so we have 4 times negative 3 plus 8 times 2.
00:46
And we have 12 plus 16 is 4.
00:50
So that means that this is the 1 by 1 matrix 4.
00:54
And that's all there is to that.
00:57
Now you also want to find b .a...