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 June 11th, 2015, 10:20 AM #1 Newbie   Joined: Jun 2015 From: House Posts: 11 Thanks: 0 Find solutions, that agrees with given conditions For example I have this dif. equation: 4y''+4y'+y=0 I need to find a solution, with given conditions: y(0) = 2 y'(0) = 0 So I solve that equation, get: k1 = k2 = -0,5 So y = (C1+C2x)e^(-0,5x) Now, to agree to those conditions, what I do: y(0) = 2. I change x to 0 in y and get C1 = 2 Then I find derivative of y, do the same thing y'(0) = 0 Then I found C2. I put values of C1,C2 in y and that's the answer?
 June 11th, 2015, 12:46 PM #2 Senior Member     Joined: Mar 2011 From: Chicago, IL Posts: 214 Thanks: 77 If I have not made a mistake , I found that $\displaystyle C_2=1$. So, you are right - just to substitute $\displaystyle C_1$ and $\displaystyle C_2$ with 2 and 1 respectively: $\displaystyle y=(2+x)e^{-0.5x}$

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