Understanding a Homework Statement | Explanation and Solution Tips

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SUMMARY

The discussion focuses on solving the differential equation x'' - 6x' + 5x = 5, specifically addressing the choice of the particular solution xp(t) = A. The contributor, EquinoX, clarifies that a constant solution is appropriate for this equation, suggesting that xp(t) = 1 would suffice. The conversation emphasizes the importance of making an educated guess for the particular solution based on the right-hand side of the equation, noting that different forms would be chosen depending on the terms present.

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Homework Statement



I have my notes below, however I don't understand the part where it says that:

xp(t) = A, where did this come from?

http://img142.imageshack.us/img142/4733/questionub.th.jpg

Homework Equations





The Attempt at a Solution

 
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Hi -EquinoX-! :smile:

You have x'' -6x' + 5x = 5.

The general solution is the characteristic solution plus any particular solution.

For the particular solution, you make an intelligent guess …

in this case, it seems obvious that a constant will do (in fact, I don't know why he bothered to say let xp(t) = A, and solve for A … I'd just have gone straight to xp(t) = 1)

(but if there was a 5x on the RHS, you'd choose a linear function, if there was an e7x, a multiple of e7x, and so on)
 

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