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Integration by parts Integral(udv)=uv-integral(duv) In this case we will make u=x and dv=8e^(8x) so du=1 and v=e^(8x) Now integral(8xe^(8x)) => xe^(8x) - integral(e^(8x)) => xe^(8x) - e^(8x)/8 => (e^(8x))(x-1/8) Final answer: (E^(8x))(x-1/8) + some constant C Hope I helped :)
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