User not logged in - login - register
Home Calendar Books School Tool Photo Gallery Message Boards Users Statistics Advertise Site Info
go to bottom | |
 Message Boards » » Math help Page [1]  
ssclark
Black and Proud
14179 Posts
user info
edit post

Hello everyone !! I'm in search of math help. I can't for the life of me figure out what to do


can ya'll help me find the difference quotient of this function ?

5/19/2016 9:28:24 PM

bbehe
Burn it all down.
18402 Posts
user info
edit post

but that is the difference quotient...

5/19/2016 10:24:18 PM

ssclark
Black and Proud
14179 Posts
user info
edit post

well that will sure make the problem easier.

5/19/2016 10:53:51 PM

Cabbage
All American
2067 Posts
user info
edit post

Yeah, what you posted is not the function, that IS the difference quotient of the function 1/(3x).

Looks like what you really want is to simplify it. What you should do first is subtract the two fractions in the top by getting a common denominator. Does that help?

5/20/2016 1:13:15 AM

krallum2016
All American
1356 Posts
user info
edit post

2 variables? infinite solutions.

5/20/2016 3:54:56 PM

0EPII1
All American
42536 Posts
user info
edit post

If you need extensive help for the course, look me up on http://www.tutormatchingservice.com -- I am probably the top earner for the site! Send me a message here.

5/21/2016 3:58:35 AM

krallum2016
All American
1356 Posts
user info
edit post

Smath can you help? Please?

5/24/2016 5:05:40 PM

PaulISdead
All American
8746 Posts
user info
edit post

OP consider yourself lucky. My AP calc class just jumped to the rule without so much of a single example.

[Edited on May 25, 2016 at 6:55 PM. Reason : The limit as h approaches zero of -1/3x^2+3h]

5/25/2016 6:54:07 PM

LastInACC
All American
1843 Posts
user info
edit post

its tree fiddy.

5/27/2016 11:43:35 AM

Cherokee
All American
8264 Posts
user info
edit post

PEMDAS

5/28/2016 10:49:15 PM

krallum2016
All American
1356 Posts
user info
edit post

theres an app for this

6/6/2016 11:19:48 AM

FykalJpn
All American
17209 Posts
user info
edit post

Wtf is a difference quotient--is that just a fraction? Fuck math, you're never gonna use it anyway.

6/6/2016 6:43:52 PM

krallum2016
All American
1356 Posts
user info
edit post

The difference quotient anwsers the question: How much did the results change in a function over a small increment of time. If that increment of time is approaches 0 then you get the derivative... for certain functions...

[Edited on June 7, 2016 at 10:15 AM. Reason : ]

6/7/2016 10:14:29 AM

FykalJpn
All American
17209 Posts
user info
edit post

So it's the slope written retardedly...

6/7/2016 11:37:44 AM

krallum2016
All American
1356 Posts
user info
edit post

Well he posted a homework problem, so its not a 'pure' mathematical expression of the difference quotient. Its a stepping stone to doing differential equations where there are multiple functions or multiple unknowns. In that case, its not necessarily as trivial to find what you have called the slope but it is easy to expand this general format to more complex blah blah blah

6/7/2016 11:45:36 AM

Cabbage
All American
2067 Posts
user info
edit post

^^It is the slope. Not sure what you find "retarded" about it. How else are you gonna write the slope between two points on a function f(x)?

6/7/2016 5:42:31 PM

FykalJpn
All American
17209 Posts
user info
edit post

m = 5

seems a lot simpler than

m = (1/(3 x+3 h)-1/(3 x))/h where h = 1 and x = sqrt(11/15)/2-1/2



[Edited on June 7, 2016 at 7:54 PM. Reason : Maybe it's just me]

6/7/2016 7:38:52 PM

Cabbage
All American
2067 Posts
user info
edit post

But m=5 is the result of some calculation, not the definition: How do you actually arrive at the result 5? That's what this is about--The process, not simply the final result.


What's the slope between the points x=1 and x=2 on the function f(x)=1/(3x)?

Sure, the answer is -1/6, but how do you actually arrive at that answer?

The way you do it is by doing [f(2)-f(1)] / (2 - 1)

That's the difference quotient.

Similarly, on the highway: if at 3:12PM you're at milepost 17, and then at 3:30PM you're at milepost 40, what's you average speed during that time?

Again, you do a difference quotient: [40 - 17] / (30 - 12) = about 1.28 miles per minute.

If that's retarded, do you have a non-retarded way of doing it?

6/7/2016 8:37:30 PM

FykalJpn
All American
17209 Posts
user info
edit post

GPS

6/7/2016 9:05:41 PM

Cabbage
All American
2067 Posts
user info
edit post

Oh, so you're just trying to be a smartass, huh?

Maybe you can find an app that will do that for you, too.

6/7/2016 9:55:36 PM

0EPII1
All American
42536 Posts
user info
edit post

Quote :
"m = 5

seems a lot simpler than

m = (1/(3 x+3 h)-1/(3 x))/h where h = 1 and x = sqrt(11/15)/2-1/2"


I can't even....

6/8/2016 1:27:00 AM

krallum2016
All American
1356 Posts
user info
edit post

Quote :
"where h = 1 and x = sqrt(11/15)/2-1/2"

glad you could answer your question for yourself

[Edited on June 8, 2016 at 11:16 AM. Reason : ]

6/8/2016 11:15:47 AM

JeffreyBSG
All American
10165 Posts
user info
edit post

I think forcing students to evaluate difference quotients is mildly retarded

7/29/2016 8:39:03 PM

PaulISdead
All American
8746 Posts
user info
edit post

One time, a retard who convinced the state of north carolina they could teach high school calculus, tried to skip this step and IMHO was wrong in doing so.

7/29/2016 9:28:15 PM

PaulISdead
All American
8746 Posts
user info
edit post

it bugs me they distributed the 3 should have kept 3(x+h) for the problem statement

[Edited on July 30, 2016 at 10:13 AM. Reason : .]

7/30/2016 10:13:16 AM

justinh524
Sprots Talk Mod
27780 Posts
user info
edit post

Lol this thread made me realize i remember nothing about calculus.

8/12/2016 1:24:46 PM

JeffreyBSG
All American
10165 Posts
user info
edit post

^^
I think they're trying to be tricky

8/15/2016 12:29:55 AM

 Message Boards » Study Hall » Math help Page [1]  
go to top | |
Admin Options : move topic | lock topic

© 2024 by The Wolf Web - All Rights Reserved.
The material located at this site is not endorsed, sponsored or provided by or on behalf of North Carolina State University.
Powered by CrazyWeb v2.39 - our disclaimer.