My Math Forum  

Go Back   My Math Forum > College Math Forum > Calculus

Calculus Calculus Math Forum


Reply
 
LinkBack Thread Tools Display Modes
March 13th, 2010, 09:01 PM   #1
Newbie
 
Joined: Mar 2010

Posts: 2
Thanks: 0

Derivatives Help

Hi. I have problems with derivatives. I was absent one day from class and I still have to do the homework. I'd greatly appreciate if anyone could help me with some problems. Thanks. The instructions:

Find dy/dx:
1) 5x^(4/5)+10y^(6/5)=15
2) sqrt(xy)=1
3) y^2= (x) / (x+1)


Any help would be greatly appreciated.
takuto is offline  
 
March 13th, 2010, 10:54 PM   #2
Global Moderator
 
Joined: Dec 2006

Posts: 19,733
Thanks: 1810

You should revise the differentiation rules.

2) sqrt(xy) = 1 implies y = 1/x, so dy/dx = -1/x.
3) y = 1 - 1/(x + 1), so 2ydy/dx = 1/(x + 1), and so dy/dx = 1/(2y(x + 1)).

What progress can you now make with the first equation?
skipjack is offline  
Reply

  My Math Forum > College Math Forum > Calculus

Tags
derivatives



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Are partial derivatives the same as implicit derivatives? johngalt47 Calculus 2 November 23rd, 2013 11:44 AM
Please Help.. Derivatives dV/dR - dV/dt fantom2012 Calculus 3 May 6th, 2012 07:53 PM
Derivatives-Help Arley Calculus 5 April 13th, 2012 06:56 PM
derivatives help r-soy Calculus 2 November 27th, 2010 08:26 AM
derivatives Calavan11 Calculus 2 December 11th, 2009 04:42 AM





Copyright © 2018 My Math Forum. All rights reserved.