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anonymous
 one year ago
Getting slightly wrong answer trying to integrate y*sqrt(y2) by parts
anonymous
 one year ago
Getting slightly wrong answer trying to integrate y*sqrt(y2) by parts

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\int y\sqrt{y2}dy\]?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes. WolframAlpha gives me: http://www.wolframalpha.com/input/?i=integrate+y*sqrt%7By2%7D which is not my answer. Can't figure out what I'm doing wrong.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0first off i would not integrate by parts unless you are told you have to

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1There's a nice simple usubstitution for this one :) Not seeing it?

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1It a neat little trick that maybe you haven't considered.\[\large\rm \color{orange}{u=y2}\qquad\to\qquad \color{red}{u+2=y}\]\[\large\rm \color{blue}{du=dy}\] \[\large\rm \int\limits \color{red}{y}\sqrt{\color{orange}{y2}}~\color{blue}{dy}=?\]Do you see how that will help here? :o

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thanks so much for the help, but I already solved it with usubstitution and am just utterly stumped as to why I can't get the right answer with integration by parts. Should I just give up on that? :)

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1ok i think i see a boo boo...

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1dw:1442370147408:dwMissing a 2 here :o

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1Did that maybe throw things off a bit?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0AH! That was it. Thank you very much!
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