|
 OJK
Registered: 06/08/03
Posts: 10,615
|
 Math Help (Please! Urgent!)
#8346341 - 04/30/08 03:34 PM (6 months, 20 days ago) |
|
|
Hey,
I have a third-year economics exam tomorrow and due to various reasons (my anxiety disorder which stops me from being able to concentrate/do work pretty much at all) I don't really know any math (in particular, differential calculus).
This image is typical of the type of differentiation required.
I know I'm in a bit of a fix, but all I need to do is pass this exam, so if anyone could show step-by-step how the below example works, I'd be really, really grateful.
Thanks 
|
 relativexistance
"beads, bees!?!?beads ....BEADS!!!"
Registered: 01/08/04
Posts: 1,468
Last seen: 11 hours, 28 minutes
|
Re: Math Help (Please! Urgent!) [Re: OJK]
#8346357 - 04/30/08 03:38 PM (6 months, 20 days ago) |
|
|
you just do a partial derivatives with respect to p1 it looks like, as in you treat p2 as constant. as in do d/d(p1) to both sides
Edited by relativexistance (04/30/08 03:46 PM)
|
OJK
Registered: 06/08/03
Posts: 10,615
|
Re: Math Help (Please! Urgent!) [Re: OJK]
#8346359 - 04/30/08 03:39 PM (6 months, 20 days ago) |
|
|
Even just describing what I need to do (e.g the names of the relevent rules etc.) would be a big help.
|
TheCow
Registered: 10/28/02
Posts: 4,637
Last seen: 4 months, 15 days
|
Re: Math Help (Please! Urgent!) [Re: OJK]
#8346372 - 04/30/08 03:44 PM (6 months, 20 days ago) |
|
|
Well, in terms of ease of explaining it, first just expand the terms out.
i.e
(p1-8)(145.2-20p1+10p2)
, multiply that through:
then youll have various terms like, some number, some number * p1, some number * p1^2, and some number * p1*p2.
You take the derivative of that which would be the following cases:
just a number, derivative is 0
number * p1 = just that number
number * p1^2 = 2 times that number*p1
number*p1*p2 = number * p2
|
Madtowntripper
Sun-Beams out of Cucumbers
Registered: 03/06/03
Posts: 13,682
Last seen: 11 hours, 24 minutes
|
Re: Math Help (Please! Urgent!) [Re: TheCow]
#8346391 - 04/30/08 03:51 PM (6 months, 20 days ago) |
|
|
Good Explanation.
--------------------
|
OJK
Registered: 06/08/03
Posts: 10,615
|
Re: Math Help (Please! Urgent!) [Re: TheCow]
#8346400 - 04/30/08 03:53 PM (6 months, 20 days ago) |
|
|
HOLY SHIT
the fact that the step with expanding the brackets had been ommitted made me think some arcane rule was being used, when in fact it was just regular differentiation
thank you so much, I'm a freaking moron
|
OJK
Registered: 06/08/03
Posts: 10,615
|
Re: Math Help (Please! Urgent!) [Re: OJK]
#8346425 - 04/30/08 04:06 PM (6 months, 20 days ago) |
|
|
Can anyone explain what's going on here?
I don't exactly know how to handle logs
|
TheCow
Registered: 10/28/02
Posts: 4,637
Last seen: 4 months, 15 days
|
Re: Math Help (Please! Urgent!) [Re: OJK]
#8347053 - 04/30/08 07:13 PM (6 months, 20 days ago) |
|
|
you gotta hit that product rule nigga
derivative of ln(p) is 1/p
|
johnm214
Registered: 05/31/07
Posts: 6,924
Loc: Americas
|
Re: Math Help (Please! Urgent!) [Re: TheCow]
#8347329 - 04/30/08 08:21 PM (6 months, 20 days ago) |
|
|
Quote:
TheCow said:
you gotta hit that product rule nigga
derivative of ln(p) is 1/p
yeah, this shit key for idiots like me
I always got stuck on stuff like that in my analytical/gen chem due to poor high school math knowledge.... Had only taken algebra and it fucked me up
|
OJK
Registered: 06/08/03
Posts: 10,615
|
Re: Math Help (Please! Urgent!) [Re: johnm214]
#8419531 - 05/19/08 09:48 AM (6 months, 2 days ago) |
|
|
I passed
thanks a million guys
|
|
login or 
register to post messages and view our members-only content. You'll gain access to additional forums, encrypted messages, file attachments, board customizations, and much more!
Previous
Index
Next
Threaded
Edit 
Reply 
Quote 
