Here's what I have done:

Am I approaching this correctly? Something is obviously wrong since the ln(-3) is undefined, which makes me think that I am doing this wrong.

Thanks!

Printable View

- September 29th 2011, 06:49 PMjoatmonFirst Order ODE

Here's what I have done:

Am I approaching this correctly? Something is obviously wrong since the ln(-3) is undefined, which makes me think that I am doing this wrong.

Thanks! - September 29th 2011, 07:00 PMpickslidesre: First Order ODE
I see it like this

etc.. - September 29th 2011, 07:13 PMjoatmonre: First Order ODE
Thanks for that. This is my very first differential equation (my deflowering, so to speak), so this is all new to me.

- September 29th 2011, 07:19 PMjoatmonre: First Order ODE
But wait...

Carrying on from where you left off:

I'm back to my same dilemma. I have the logarithm of a negative number. How do I handle that? Thanks again. - September 29th 2011, 07:44 PMpickslidesre: First Order ODE
- September 29th 2011, 07:50 PMjoatmonre: First Order ODE
I thought of that, too, that the constant can always push the equation positive. Where I am confused is that when I run this problem through Wolfram (or my calculator) to check my work, it shows the answer as . I'm just trying to understand whether I am getting the right answer or not, and I have two sources (that I trust more than my own work) that have a slightly different answer.

Any thoughts? Thanks again. - September 30th 2011, 07:45 AMAckbeetRe: First Order ODE