How do I go about solving a DE using the method of undetermined coeficients in a question like for example;(adsbygoogle = window.adsbygoogle || []).push({});

y''-4y'+4y=2e^2x

I tried assuming the yp to be Ae^2x but when I plugged it into the DE I ended up with 0=2e^2x

??

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# Undetermined coefficients

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