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EV33
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Homework Statement
t²y"-t(t+2)y'+(t+2)y= 2t³
y1(t)=t
y2(t)=te^t
t>0
Homework Equations
w(t)=y1*y2' - y1*y2
g=2t
y=-y1∫(gy2)/w + y2∫(gy1)/w
The Attempt at a Solution
y1=t
y1'=1
y2=te^t
y2'=e^(t)+ te^(t)
w(t)=te^(t)+t²e^(t)-te^(t)=t²e(t)
∫(gy2)/w=∫(2t²e^(t))/(t²e^(t))=∫ 2dt=2t+c1
∫(gy1)/w=∫(2t²)/(e^(t)t²)=∫2e^(-t) dt=-2e^(-t) + c2
my final answer:
y=-2t²-tc1-2t+te^(t)c2
The book some how got rid of the C's...
The answer in the book is:
Y(t)= -2t²
I have no idea how to solve for the c1 and c2 without initial conditions.
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