
Differential Equations Ordinary and Partial Differential Equations Math Forum 
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May 5th, 2017, 07:22 PM  #1 
Newbie Joined: Mar 2016 From: Australia Posts: 21 Thanks: 1  Solution not matching with WolfRam
I'm checking my solution with WolfRam and it's not matching. I can't see where I'm going wrong, anything obvious I'm missing? Differential equation: $\displaystyle 3y''+y'2y=4+2x+e^x$ Initial conditions: $\displaystyle y(0)=3, y'(0)=2$ My working: working_1.jpg working_2.jpg Last edited by max233; May 5th, 2017 at 07:38 PM. 
May 6th, 2017, 01:39 AM  #2 
Senior Member Joined: Jun 2015 From: England Posts: 734 Thanks: 207  You should check by substituting your solution into the original differential equation to see whether $\displaystyle 3y'' + y'  2y$ does indeed equal $\displaystyle 4 + 2x + {e^x}$ I'm not sure it does, but it is a deal of arithmetic and I might just as easily have made a mistake there as you. Last edited by skipjack; May 6th, 2017 at 05:56 AM. 
May 6th, 2017, 06:07 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 18,568 Thanks: 1483  

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