Given this ode system:
x' = 2x+y-7e^(-t) -3
Find all the bounded soloution in [a,infinity) when a is a real number...
I'm not realy sure what is a sufficient condition for bounded soloution in this question...Maybe there's something we can do and then we will not even need to solve the system...
Help is Needed!!
TNX a lot!
1. why should I discard the eignvalues with positive real part? How come it's a sufficient condition for bounded soloutions?
2. " What is left will give the bounded solutions. " Why? The soloution I'll get by using the eignvalues will be a soloution for the homo. system only... I need a soloution for the whole system... How come the soloutions for the homo. system with a non-positive real part will give me the bounded soloution for the whole system?
Now, what are the eigenvalues of that matrix?
I know everything you said, but tnx for the reminder...
I've answered the question you've asked in the msg above you-
The eignvalues are 2+i, 2-i, and they both have positive real part... In order to solve the entire system, we need to find fundemental basis of soloutions for the homo. system and one private soloution of the non-homogenic one...
If we'll take 2+i, and find its eigenvectors, we'll get: (1,i) ... So we have a soloution:
e^(2+i)t*(1,i)...Its real part is one soloution which is independant with the imag. part...So we'll get these two soloutions:
x1= e^2t [ cost(1,0) -sint(0,1) ]
x2 = e^2t[ sint(1,0) +cost(0,1) ]
In order to solve the system, we now have to find a private soloution for the non-homogenic system, but it seems to be a very long process... Maybe from the two soloutions for the homo. system we will be able to find all the bounded soloutions for the entire system... As you can see, I realy need help here...