Verify that \( y=(a+b x) e^{2 x} \) is the general solution of the ...

Verify that \( y=(a+b x) e^{2 x} \) is the general solution of the differential
\( \mathrm{P} \) equation \( \frac{d^{2} y}{d x^{2}}-4 \frac{d y}{d x}+4 y=0 \).

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