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August 30th, 2010, 08:08 AM  #11 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 520 Math Focus: Calculus/ODEs  Re: Help working out this differential equation...
Whenever you find an indefinite integral it is proper to add a constant, as the derivative of a constant is zero. For example ?(u)du = ½u² + C since d(½u² + C)/du = u + 0 = u If you'll notice in skipjack's post, the constants A and B were the socalled constants of integration. It might seem a trivial matter, but could lose you points on an exam. 
August 30th, 2010, 08:32 AM  #12  
Newbie Joined: Aug 2010 Posts: 13 Thanks: 0  Re: Help working out this differential equation... Quote:
 

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