- #1
icosane
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Homework Statement
y''+16y=9xe^(4x)
y(0)=0
y'(0)=0
find the solution, y(x) to the differential equation
The Attempt at a Solution
I found the particular solution to the right side of the equation, which is correct,
yp= .28125x-.0703125e^(4x)
For the left hand side of the equation I ended up with +- 4i, so using 4 as the beta value plugged it into,
y=Acos(4x)+Bsin(4x)
But plugging back into y''+16y I found it was the complementary equation... but does it even matter because there are no sines or cosines on the right hand side of the equation? I tried writing out the solution as
y = Acos(4x)+Bsin(4x) + .28125x-.0703125e^(4x)
Then solving it like an initial value problem but the computer won't take my answer. Any help would be greatly appreciated.