Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
TomLikesPhysics
Group Title
I need some help with an Integral (Substitution).
 one year ago
 one year ago
TomLikesPhysics Group Title
I need some help with an Integral (Substitution).
 one year ago
 one year ago

This Question is Closed

TomLikesPhysics Group TitleBest ResponseYou've already chosen the best response.0
\[\int\limits_{?}^{?}x^2*\sqrt{3x^2+4}dx\] I started with \[u = 2x^3 +4\] \[du = 6x^2dx \rightarrow x^2dx=1/6 * du\] \[\int\limits_{?}^{?}\sqrt{u}*du/6 = 1/9 * \sqrt{u^3} = 1/9 * \sqrt{(2x^3+4)^3}\] But Wolfram got something else entirely but I fail to see my mistake.
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
its 3x^2+4 in sqrt but u put u = 2x^3+4.....
 one year ago

TomLikesPhysics Group TitleBest ResponseYou've already chosen the best response.0
Sry I got the first line wrong. This is the integral I am supposed so solve. \[\int\limits_{?}^{?}x^2*\sqrt{2x^3+4} dx\]
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
i don't see any fault in your work.
 one year ago

TomLikesPhysics Group TitleBest ResponseYou've already chosen the best response.0
Ups sry. There is no mistake. Wolfram just pulls a 2 out of the squareroot term.
 one year ago

TomLikesPhysics Group TitleBest ResponseYou've already chosen the best response.0
Thanks for the douple checking.^^ I am sorry.
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.1
no problem welcome :)
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.