[JMAC]

got very lil time
I need to know for what values of X these functions have a horizontal tangent

y= square root (1+X) devided by X

and y=(2X+1)^4(5X-1)^3

please help

 

[LordOpie]

not sure where you are in calc. Did they tell you that if you set the first derivative = 0 and solve that'll tell you the points you need?

 

[Toshi]

explaining the above a bit more: first derivative will be slope. "horizontal tangent" ==> slope = 0. so take the first derivative, set it equal to zero, solve for X.

a fun resource: http://mathworld.wolfram.com/

 

[LordOpie]

did you know that if you set marginal costs = marginal revenues that you'll maximize profit?

fvck if I'm gonna let Toshi show me up

 

[JMAC]

i';m super lost now the teacher hasn't even explained this stuff yet and it's on an assignment due tomorrow. I;m sooo screwed lol

 

[Toshi]

dude. i actually have two "mathematica spoken here" posters on my room's wall. you can't top that for math nerdiness (not that it takes much of a math nerd to appreciate slope = 0. pay attention in class JMAC )

 

[Toshi]

the right two ones, to be exact

to my credit i was given them, at least

 

[LordOpie]

pay attention in class JMAC )

lmao

Toshi, is there a way for that to be solved without taking a derivative? I just realized those function require some serious first derivative crunching... power and quotient rules. There's no way a teacher could get that deep without having explained local minimums and maximums and hence, JMAC not paying attention... unless there is another way to solve that with 'easier' math?

 

[JMAC]

dude. i actually have two "mathematica spoken here" posters on my room's wall. you can't top that for math nerdiness (not that it takes much of a math nerd to appreciate slope = 0. pay attention in class JMAC )

Dude I know how to do derivative stuff but thats the first time I have ever heard the slope =0 i looked through all my notes lol

 

[LordOpie]

http://www.clas.ucsb.edu/staff/lee/Max%20and%20Min's.htm

 

[Toshi]

hmm. you're right. maybe the teacher is trying to hint at limits. that second equation makes little sense as written, maybe a missing division?

 

[JMAC]

http://www.clas.ucsb.edu/staff/lee/Max%20and%20Min's.htm

Thanks i get it now. Lol solving for x is still giving me trouble

 

[Toshi]

Dude I know how to do derivative stuff but thats the first time I have ever heard the slope =0 i looked through all my notes lol

first derivative is slope. when this is 0 the slope is 0 (duh)
second derivative is how the slope is changing. when this is zero we have points of inflection

read more here: http://www.ucl.ac.uk/Mathematics/geomath/level1/diffnb/difflnk20.html

 

[LordOpie]

i forget, was there some sort of limit involving secant lines?

 

[JMAC]

kk i got it, i think thanks for all the help

 

[LordOpie]

yeah, but now I'm trying to mess with your brain and screw you up for tomorrow. Try "u" substitution or rotate it about the axis. Remember the

 

[JMAC]

yeah U substitution would ahve made it easier actaully. Rotating it thats messing me up now

 

[The Kadvang]

I own that class.

 

[mserko1]

calculus is hard.

 

[JRB]

i';m super lost now the teacher hasn't even explained this stuff yet and it's on an assignment due tomorrow. I;m sooo screwed lol

It must be that you are over emphasizing your studies towards grammar.

 

[JRB]

One more thing JMAC. Quit saying LOL. There is nothing funny when you are discussing an equation.

 

[-dustin]

derivatives are easy...wait till you get to stupid ****ing integrals. i hate calculus.

 

[johnbryanpeters]

Or differential equations... "Let us guess that the answer is of the form..." AARGH!

 

[BikeGeek]

Math makes my head hurt. I've been working with this one and several different sets of cost data:

y=a[∑i^b] where i=1 to x and b=ln(c)/ln(2)
y, a, and x are known, solving for c

 

[LordOpie]

Math makes my head hurt. I've been working with this one and several different sets of cost data:

y=a[?i^b] where i=1 to x and b=ln(c)/ln(2)
y, a, and x are known, solving for c

try raising both sides to e... that might get rid of you ln and leave you with c/2

 

[BikeGeek]

try raising both sides to e... that might get rid of you ln and leave you with c/2

It took me a while, but I figured it all out. In the middle of it I had to laugh because I realized that I was using the math I swore I'd never have to use.

That "?" in the formula was supposed to be that greek summation symbol, sigma, I think.

 

[math2014]

Derivatives and Integrals are nice and easy, heck even 3rd degree differential equations are easy....
stochastic differential equations though.... kalman filters..... no-no land...

btw, get maple7... it solves everything.... highly recommended.

 

[JRB]

Oh joy - I just can't get enough of this thread. yay.

 

[-dustin]

Oh joy - I just can't get enough of this thread. yay.

wanna hijack it and start talking about dominant Vs, dimished viis, and +VIs?

 

[math2014]

No we should talk about endogeneity, auto-correlations and GARCH processes

 

[JRB]

wanna hijack it and start talking about dominant Vs, dimished viis, and +VIs?

Can we just talk about inner tubes or tooth brushes or something else interesting???

 

[LordOpie]

Can we just talk about inner tubes or tooth brushes or something else interesting???

haha, Echo hacked loco's account! :devil:

 

[Toshi]

wanna hijack it and start talking about dominant Vs, dimished viis, and +VIs?

i'd be down to talk theory too . math theory, music theory, both are fun