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3psilon
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How to integrate (62x)^2 . (indefinite integral). I'm trying U sub but Idk what I'm doing wrong
 one year ago
 one year ago
3psilon Group Title
How to integrate (62x)^2 . (indefinite integral). I'm trying U sub but Idk what I'm doing wrong
 one year ago
 one year ago

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TuringTest Group TitleBest ResponseYou've already chosen the best response.1
what did you use for u ?
 one year ago

TuringTest Group TitleBest ResponseYou've already chosen the best response.1
can you show your sork? what did you get for du? what did you get for dx?
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.1
U = 62x du = 2dx \[(1/2) \int\limits_{}^{} 2U^2dx\] @TuringTest
 one year ago

TuringTest Group TitleBest ResponseYou've already chosen the best response.1
I'm not seeing where you get the 2 from... u=62x du=2dx > dx=du/2
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.1
It's to get du right ? so I multiply by 1 pretty much 2/2
 one year ago

TuringTest Group TitleBest ResponseYou've already chosen the best response.1
you have left your integral all mixed up with u integrated with respect to x; you can't do that. I think you are getting confused there. you need to sub in the values: u=62x du=2dx > dx=du/2 subbing in for u and dx gives\[\int u^2(\frac{du}2)=\frac12\int u^2du\]
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.1
Ohhh thank you turing!
 one year ago

TuringTest Group TitleBest ResponseYou've already chosen the best response.1
Welcome!
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.1
We weren't taught how to solve for dx and plug back in but I like that way!
 one year ago

TuringTest Group TitleBest ResponseYou've already chosen the best response.1
I sort of never saw them do it in class that way either, I never understood why :p
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.1
@TuringTest What answer are you getting ? I get \[\frac{(62x)^{3}}{6} +c\] But my TI89 is giving me\[\frac{4(x3)^{3}}{3} +C\]
 one year ago

TuringTest Group TitleBest ResponseYou've already chosen the best response.1
it is the same answer; they appear to have factored out a 2 in your TI89
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.1
Ohh okay! Thanks! :)
 one year ago
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