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Hey math nerds
Posted: Sun May 22, 2011 8:46 pm
by futuresailors
I've been trying to help my girlfriend with her math homework, but haven't done more than arithmatic in 5 years...
Anyways, her book is a piece of shit, soooo...
Finding dx/dt
let's say we have y^3=16x^2
x=4 and dy/dt=2
I'm sure there's some simple process, but all I could figure is that you need to chain rule that shit...
Halp?
Re: Hey math nerds
Posted: Sun May 22, 2011 9:23 pm
by mysteriousj
ughh it's been 2 years for me since i did this but i'll try..
so ...
y=(16x^2)^(1/3)
dy/dx=(1/3)*{(16x^2)^(-2/3)}*32x
so if dy/dx=(dy/dt)*(dt/dx)..
then dt/dx= (dy/dx)/(dy/dt)
so dx/dt = (dy/dt)/ (dy/dx)
Then plug in those numbers and stuff and solve I think??
Re: Hey math nerds
Posted: Sun May 22, 2011 9:23 pm
by MEC
http://www.wolframalpha.com/It takes a minute to figure out how to navigate but once you do.
Re: Hey math nerds
Posted: Sun May 22, 2011 9:28 pm
by mysteriousj
This. I'm probabaly wrong hahaha
Re: Hey math nerds
Posted: Sun May 22, 2011 9:58 pm
by tuffteef
good god is she legal? if she has math homework
Re: Hey math nerds
Posted: Sun May 22, 2011 10:39 pm
by Ironbird13
tuffteef wrote:good god is she legal? if she has math homework
i was chatting to this 13 yr old girl online, she seemed really cool, then she told me she was a detective. i thought, what a cool job for someone so young.....
*not a true story*
Re: Hey math nerds
Posted: Sun May 22, 2011 10:55 pm
by tuffteef
Ironbird13 wrote:tuffteef wrote:good god is she legal? if she has math homework
i was chatting to this 13 yr old girl online, she seemed really cool, then she told me she was a detective. i thought, what a cool job for someone so young.....
*not a true story*
i would not be surprised if it was a undercover cop
i mean he is under investigation for being the nyc beach murderer
Re: Hey math nerds
Posted: Mon May 23, 2011 12:33 pm
by futuresailors
mysteriousj wrote:ughh it's been 2 years for me since i did this but i'll try..
so ...
y=(16x^2)^(1/3)
dy/dx=(1/3)*{(16x^2)^(-2/3)}*32x
so if dy/dx=(dy/dt)*(dt/dx)..
then dt/dx= (dy/dx)/(dy/dt)
so dx/dt = (dy/dt)/ (dy/dx)
Then plug in those numbers and stuff and solve I think??
That was the one!
tuffteef wrote:Ironbird13 wrote:tuffteef wrote:good god is she legal? if she has math homework
i was chatting to this 13 yr old girl online, she seemed really cool, then she told me she was a detective. i thought, what a cool job for someone so young.....
*not a true story*
i would not be surprised if it was a undercover cop
i mean he is under investigation for being the nyc beach murderer
Define legal...
And I have two solid alibis that explain the sand in my shoes!