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anonymous
 5 years ago
f(x)=x^2*e^(x)
how can i solve the integral?
anonymous
 5 years ago
f(x)=x^2*e^(x) how can i solve the integral?

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amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0i now there are some representations of e^x that cant be integrated.... forget why..

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0but for this; just int by parts using x^2 as u; and v as e^...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes, but how i deal the absolute value?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0an absolute value is always positive; and the opposite of an always positive value is always negative right?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0just redefine it; x = a perhaps

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Shouldn't i divide the integral into two cases? x = x if x>0 and x = x if x<0?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0http://www.analyzemath.com/calculus/Differentiation/absolute_value.html

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.0Yeah, I think that's the way you have to go.

watchmath
 5 years ago
Best ResponseYou've already chosen the best response.2Is this a definite integral or indefinite?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0The exercise is to solve the integral from inf to inf

watchmath
 5 years ago
Best ResponseYou've already chosen the best response.2That makes a difference \(\int_{\infty}^\infty x^2e^{x}=2\int_0^\infty x^2e^{x}\,dx\) and you can use integration by parts.

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0thats what I had in mind :) just couldnt spell it out well enough ...
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