Linear Differential Equations and Linear Operator Problem

whitegirlandrew
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Homework Statement


I'm not sure how to approach this. The question involves linear operators and a non-homogenous differential equation.
Here is the question:
https://s15.postimg.org/cdmw80157/Capture.png

Homework Equations


They are given in the question

The Attempt at a Solution


I really have no idea on how to approach it. I was thinking something along the lines of setting c1*y1+c2*y2+c3*y3 as a linear combination and setting them equal to the non-homongenous term g(x). Then i can find the values of c1,c2,c3.
 
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whitegirlandrew said:

Homework Statement


I'm not sure how to approach this. The question involves linear operators and a non-homogenous differential equation.
Here is the question:
https://s15.postimg.org/cdmw80157/Capture.png

Homework Equations


They are given in the question

The Attempt at a Solution


I really have no idea on how to approach it. I was thinking something along the lines of setting c1*y1+c2*y2+c3*y3 as a linear combination and setting them equal to the non-homongenous term g(x). Then i can find the values of c1,c2,c3.

[Edited] You want to take a linear combination of the ##L(y_i)##'s (the right hand side of the equations) equal to ##g(x)##, not the ##y_i##'s themselves. Then use your constants to build the particular solution from the ##y_i##'s.
 
Last edited:
I did L(c1y1+c2y2+c3y3)=g(x)=c1*L(y1)+c2*L(y2)+c3*L(y3)
Then I sub in the L(y1), L(y2), and L(y3) for what was given to me. This leads me to find the constants. Then c1=10/12, c2=0, and c3=5/6.
However this was wrong.
 
whitegirlandrew said:
I did L(c1y1+c2y2+c3y3)=g(x)=c1*L(y1)+c2*L(y2)+c3*L(y3)
Then I sub in the L(y1), L(y2), and L(y3) for what was given to me. This leads me to find the constants. Then c1=10/12, c2=0, and c3=5/6.
However this was wrong.
I corrected my reply while you were looking at it. Sorry. See if it makes sense now.
 
Ah I see. I got the question wrong so I don't know the answer. I will try this once the solution comes out. Thanks for the help.
 
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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