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anonymous
 5 years ago
whats the integral of xe^(4x)
as x approaches infinity?
anonymous
 5 years ago
whats the integral of xe^(4x) as x approaches infinity?

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mathteacher1729
 5 years ago
Best ResponseYou've already chosen the best response.0\[\int_{}^{\infty} xe^{4x}dx\] What is the lower limit? really can't do much without that.

mathteacher1729
 5 years ago
Best ResponseYou've already chosen the best response.0\[\int_{4}^{\infty} xe^{4x}dx\] is that the problem?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0its not infinity or infinity, but I cannot find out the answer

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Integrate by parts u=x and dv=e^4x change infinity to t, then evaluate as a limit

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0(as t goes to infinity)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[\lim_{4 \rightarrow \infty} x e^{4x} e^{4x} ?\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yep, you got the integral right. now sub in your upper and lower limits. Now you should have something with t in it ( y(t) ) Take the limit of this as t goes to infinity
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