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[lat77]

Wrong section, sorry! First time user.

 

[Hiche]

ydx = - (1 + e^x)dy then \frac{dx}{-(1 + e^x)} = \frac{dy}{y}

This is separable, right? Or you are required to use a substitution?

 

[lat77]

Sorry, I left out a y in the parenthesis. Reread the problem now... that's why substitution was required.

 

[tiny-tim]

is this the same as https://www.physicsforums.com/showthread.php?t=610993 ?