Transport Equation IVP Solution

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Homework Statement



Hi guys, I'm having trouble with a homework problem:

I will have to solve for the IVP of a transport equation on R:

the equations are:

Ut-4Ux=t^2 for t>0, XER
u=cosx for t=0, XER




Homework Equations



transport equation

The Attempt at a Solution




This non-linear transport solution is throwing me off. I don't know if I am supposed to use D'alemberts(As I have been doing for my previous HW problems)
Also, I can't directly solve for the homogeneous equation which in turn makes the u=cos x part very hard to solve
 
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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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