- #1
Math10
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- 0
Homework Statement
Find a particular solution of y"+2y'+y=8x^2*cosx-4xsinx. The answer is yp=-(14-10x)cosx-(2+8x-4x^2)sinx.
Homework Equations
None.
The Attempt at a Solution
r^2+2r+1=0
(r+1)^2=0
r=-1, -1
y=Axe^(-x)+Be^(-x)
So what should the initial guess yp be for this problem? How to find the initial guess yp?