00:01
So now we're going to find the unit vector for u, which we could use the formula u over the magnitude of u.
00:13
So we're going to find the component vector, which we are given to us, and then we're going to find the magnitude.
00:19
So we already have the u, so that is negative 2, 4.
00:27
So we're going to find the magnitude.
00:29
That's going to be the square root of u, which is negative 2 squared plus.
00:36
The other part of u, 4 squared.
00:40
Okay, that's going to get a square root of negative 2 squared, which is 4, plus 4 squared, which is 16.
00:50
Combined like terms, and you get square root of 20.
00:56
Okay, and we know that u, so now we're going to find the unit vector.
01:05
And now that we know that u is negative 2, 4, we could put that on top.
01:10
We already knew that.
01:12
And we put that over square root of 20.
01:16
Okay.
01:18
So then another way to write this is negative 2 over square root of 20.
01:32
And then 4 square root of 20...