- #1
iRaid
- 559
- 8
Homework Statement
[tex]\frac{dx}{dt}=x-x^{2}[/tex]
Homework Equations
The Attempt at a Solution
I think the only thing I have wrong so far is how to finish it because I can't find anything wrong with my work, but I don't know how the book gets their final answer.
Separate variables...
[tex]\int \frac{dx}{x(1-x)}=\int dt[/tex]
Partial fraction decomposition..
[tex]\int (\frac{1}{x}-\frac{1}{x-1})dx=t+C\\ln|x|-ln|x-1|=t+C\\ln|\frac{x}{x-1}|=t+C[/tex]
Using properties of e...
[tex]\frac{x}{x-1}=e^{t}e^{C}[/tex]
D=e^C (professor wants us to write it like this) and multiply by x-1 on both sides..
[tex]x=De^{t}(x-1)[/tex]
That's not the solution though and I'm not sure why.
Final answer: [tex]x(t)=\frac{C}{C-e^{t}}[/tex]