# Trouble with particular solution of differential equation - rewrite my answer?

1. Aug 27, 2012

### cowmoo32

Trouble with particular solution of differential equation - [SOLVED]

1. The problem statement, all variables and given/known data
Find the particular solution of the differential equation

satisfying the initial condition

3. The attempt at a solution
[STRIKE]I end up with (1/2)ln(-x^2+10x) which does satisfy the initial conditions, yet it's coming back as incorrect. Is there another way I can write the formula?[/STRIKE]

I figured it out, check post #3

Last edited: Aug 27, 2012
2. Aug 27, 2012

### Staff: Mentor

Show how you got the result you show. I assume you mean y = (1/2)ln(-x2 + 10x).

Satisfying the initial conditions is not enough: the solution has to satisfy the differential equation, too.

3. Aug 27, 2012

### cowmoo32

Scratch that above, I had a negative out of place. See below. I corrected it and it's coming back as correct.

$\frac{dy}{dx}$=e-2x(x-5)

$\int$ (e2y)dy = $\int (x-5)dx$

e2y = x2 - 10x + C

2y = ln(x2 - 10x + C)

C = 50

Last edited: Aug 27, 2012