Exact Solution for Linear ODE with Initial Condition

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Consider the ODE

dy/dx + 0.6y = 0.5e^(-(1.1)x) , y(0) = 4

solve the ODE subject to the given condition using exact methods and evaluate the solution y for x = 0.0 (0.05) 0.5, (i.e from x = 0 to x = 0.5 in steps of 0.05)

I am terrible with ODEs and would greatly appreciate help in rearranging and staring off this question. I am sure its not terribly difficult but to me it is. Thanks in advance.
 
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Well, it's linear so start by finding an integrating factor.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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