Equation: $y'' - y = (4x + 4)e^x$ The complementary solution is not a problem. However when attempting the particular solution, I run into a problem. Which form do I assume? I have attempted everything from a linear function to a cubic.
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1Did you try a polynomial times $e^x$? – eyeballfrog Apr 17 '23 at 18:01
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$(ax^2+b)e^x$ seems to work – WW1 Apr 17 '23 at 18:13