Here's the question you clicked on:
xoMelissa89
integral of xe^(-2x)
did you try integrating by parts?
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let u = x du = dx let dv= e^(-2x)dx v = (-1/2) e^(-2x) remember: (uv)' = u'v + v'u => v'u = (uv)' - u'v
the answer above is correct, except i believe the middle term is positive, not negative. I have done it twice by parts.
I go with @JoãoVitorMC, both terms are negative!