00:01
We're going to find a solution of this differential equation.
00:04
We're given we have this one solution of the homogenous equation.
00:08
So first of all, write that down.
00:13
Homogenous equation, we just ignore what's on the left or the right -hand side.
00:22
All right? and it's easy to see that this satisfies this equation.
00:26
Equation.
00:26
And then we say y2 is some unknown function u times e to the minus x.
00:36
And then substitute that in.
01:29
We're factoring out the e to the minus x.
01:59
Alright.
02:01
So now, so we can see that the u terms cancel out.
02:09
And then we get an equation that looks like this.
03:42
So c is some arbitrary constant of integration.
03:45
Actually, i'll call it c1, because we've got another integral to do.
03:50
So we take the exponential of that.
04:06
So there's our u.
04:12
So that actually shows us both solutions.
04:16
So that's our y sub c...