Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

DLS Group TitleBest ResponseYou've already chosen the best response.0
\[y=(3x^2+6x+5)^{(7/2)} \]
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
use the chain rule ley u = 3x^2 + 6x + 5 , then y = u^(7/2) find du/dx and dy/du then dy/dx = dy/du * du/dx
 one year ago

DLS Group TitleBest ResponseYou've already chosen the best response.0
I did the same.
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
ok  and what did you get?
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
7/2(3x^2 + 6x + 5)^(5/2) * (6x +6)
 one year ago

DLS Group TitleBest ResponseYou've already chosen the best response.0
Im little confused.. Will it be like this? \[y=\frac{(3x^{2}+6x+5)^{7/2}}{d(6x+5)} \times \frac{d(6x+5)}{d5} \] something like this? perhaps confused..
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
y = u^(7/2) dy/du = (7/2) u^(7/2  1) = (7/2) u^(5/2) substituting back for u dy/du = (7/2) ( 3x^2 + 6x + 5)^(5/2) du/dx = 6x + 6 now multiply the two results together gives (7/2)(6x+6)(3x^2 + 6x + 5)^(5/2)
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
with practice you won't need to do the substitution u
 one year ago

DLS Group TitleBest ResponseYou've already chosen the best response.0
how did u get 6x+6
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
6x + 6 is the derivative of 3x^2 + 6x + 5 the du/dx in the above post
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
you use chain rule when you have a 'function of a function' like this one 3x^2 +6x + 5 is the 'inside' function of (3x^2 +6x + 5)^7/2
 one year ago

DLS Group TitleBest ResponseYou've already chosen the best response.0
i have some more questions im confused with!
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
i'm sorry but i must go now
 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.