# Linear First Order ODE? Substitution?

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• Sep 19th 2009, 12:09 AM
yianni
Linear First Order ODE? Substitution?
*edit*
Solved, please delete topic.
• Sep 19th 2009, 12:23 AM
chisigma
Let's write the DE in general form as...

$\frac{dq}{dt} = a\cdot q^{2} + b = b\cdot (1+\frac{a}{b}\cdot q^{2})$ (1)

... and it can be solved in standard fashion writing...

$\frac{dq}{1+ \frac{a}{b}\cdot q^{2}} = b\cdot dt$ (2)

... and then integrate both terms...

Kind regards

$\chi$ $\sigma$
• Sep 19th 2009, 08:05 AM
Krizalid
Quote:

Originally Posted by yianni

*edit*
Solved, please delete topic.

no, what'd be the fun with that? it makes no sense.

do you believe is right by deleting each topic that is solved? (or if you solved by your own?) then people here would learn nothing, so in that case a math forum shouldn't exist.

think again before deleting a question.