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Common math questions, quality answers.
Jul24-14 10:02 AM Greg Bernhardt 
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Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed.
Aug5-14 02:05 PM fredoniahead 
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All math courses. PDFs, tutorials and web links.
Y 01:06 PM phion 
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Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:23 AM
micromass
1 39,229
Hi guys, I am sort of new here. So I am not pretty sure if I am to post this question in here. I am a software...
Mar21-09 08:23 PM
mathman
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Hi, well I need something close to curve fitting. But I am not sure if it could serve the purpose. The problem is as...
Mar13-09 09:19 AM
Learner
2 1,158
I can't understand the different conditions given and from that equation of the circle is found.For example. How...
Jul10-07 11:08 PM
Werg22
7 5,943
Find the equation of the family of parabolas having fixed directrix. Thanks for any help.
Sep3-08 08:34 AM
lizzie
0 1,110
What is it?!! I have tried plotting dummy data showing y values halving as x values double and no simple type of...
Jun22-13 08:43 AM
Miffymycat
6 890
Hey, Usually I have a general idea how to tackle a problem when posting on here. This time I am pretty darn lost...
Aug23-05 10:25 AM
HallsofIvy
5 11,312
1.Find the equation of the line joining A(-1, 9) to B(6, 12). Another line passes through C(7, -5) and meets AB at...
Oct10-04 01:54 PM
omicron
2 917
T= ln x/k divided by (x-k) I need to rearrange this equation to solve for x. This is not a homework assignment....
Jun6-13 03:04 PM
JJacquelin
5 632
so here's the question: if you have some equation relating a function, f(x), and its inverse, f-1(x), can you solve...
Oct26-12 04:32 PM
mathwonk
8 1,128
Hi, Thanks for taking the time to look at my problem. I'm following a worked example in a text book and I have...
Dec2-09 12:42 PM
SJB
2 771
Hi folks, I have a differential equation which looks like sin(f) + \frac{1}{Q}\frac{d(f)}{dt} + \frac{d^2(f)}{d...
Nov11-10 03:15 PM
CompuChip
4 743
I have 4 difftiate equations now I want to solve them but i have no idea dx/dt=ax+by dy/dt=cy+dz dz/dt=ez+fu...
Feb3-06 12:33 PM
SGT
6 1,366
Can anyone tell me how to solve.... 400sinA + 500cosA = 600 Just doin some statics problems and for one of 'em I...
Apr18-07 04:12 PM
Werg22
5 1,532
Can anyone help me rearrange this equation so that t is isolated please, it's driving me nuts. x = tB + (1 - t)A ...
Jul27-09 08:01 AM
HallsofIvy
14 936
In the attached image, how are equations 1, 2, 3 and 4 used to come to the final equation of 5 and 6? Im suspecting it...
Jul19-11 08:08 AM
exidez
12 1,024
I am making a game that has some sort of physics equations, although heavily modified to make it work better. I am...
Oct22-13 12:02 AM
Pharrahnox
8 731
Hi,Few days I m trying to find out,what is difference between equation and function,but as I go deeper into it,I m...
Apr15-13 06:32 PM
awecrump
3 693
I have (attached picture) 2 equations with the unknows u_k*, u_k, v_k, v_k*, where * denotes complex conjugate. Is it...
Mar13-14 06:48 PM
aaaa202
0 360
hello everyone, I usually post my questions on one small czech mathematical forum, but here is an equation noone...
Apr16-08 10:30 AM
Roberto Bramb
4 1,604
For the standard equation z = z^2 + c, z diverges if the magnitude of z exceeds 2. I know there are also threshold...
Jan21-05 08:00 PM
Moose352
0 1,089
Hi I hope someone can either help me directly and give me an overview of what needs to be done and also direct me to a...
Apr13-13 06:22 PM
mikeph
8 519
Greetings PF, I am would like to play with using an automated theorem prover to reason about categories. I would...
Aug23-10 06:26 PM
icantadd
0 576
Hey! I found one difficult equation for me... It is: Valid for real numbers a, b, c, d: a + b = c + d ad = bc...
Dec28-12 12:09 PM
Michael Redei
3 867
Equations that have x^3 or x^4 etc...,are solved with method of Horner. There is quicker way to solve an equation...
Sep29-13 12:15 PM
h6ss
1 680
Greetings, Given three points P1 P2 P3 on a circle in x,y,z coordinates, I am trying to figure out how to get the...
Apr15-10 10:51 AM
HallsofIvy
3 1,050
Hi all I have a log-log graph as attached and would like to find the equations of the lines plotted on it. If I...
Sep9-10 03:43 PM
a3sportback54
0 1,418
I was wondering if anyone had a good method for creating an equation from a set of coordinates. Let's say I have a...
Feb7-11 10:04 AM
jjj888
2 1,714
Not quite understanding what creates a plane, and what creates a line in 3D. Are vectors points in the plane with a...
Feb4-12 08:21 AM
lonewolf219
3 2,070
Dear All, Currently I'm working out a formula for Destroyers in the online game BattleGround Europe to be able to...
Aug23-06 03:53 PM
Adder_Noir
15 1,498
My maths skills are so rusty that I can't figure out how I simplify these equations so that I get a formula for x and...
Mar20-13 06:40 PM
AlephZero
4 643
If we are asked to place 3 points on the surface of a sphere so that they are equidistant, it's easy to visualize that...
Apr3-14 09:54 PM
DrewD
10 664
Hi all, How would you determine the angle i in the following equilateral triangle. ...
Jun3-13 04:00 PM
EvanT
2 690
Suppose I have a directed graph in Rn. Where the graph is a hypercube, (a square in R2, a cube in R3 etc). Suppose...
Apr5-03 05:00 AM
Pauly Man
4 7,360
Question, List the members of the equivalance relation on {1,2,3,4,5} by the given partition. Identify the equivalance...
Apr15-04 08:08 AM
ptex
7 1,253
Is there a way to figure out the number of equivalence classes for all graphs of order n, size k?
Jun14-09 11:22 AM
CRGreathouse
1 1,430
Hi, When I was just walking through the hallway of my department I found an exercise sheet asking the student to...
Nov10-08 10:46 AM
HallsofIvy
3 1,991
Hey I can't see how x~x+1 is an equivalence relation on the real numbers? I don't understand what the relation...
Nov13-09 08:57 AM
andlook
6 1,158
Sorry for such a basic question, but I don't know what they mean by the O, o, and ~ in a book I am reading. I'll write...
Dec14-10 03:51 PM
mathman
1 613
Hi, Here is my question. I need to prove the following an equivalence relation. Let A = {1,2,3,4,5} X {1.2,3,4,5}...
Jun5-07 02:10 AM
Dream
8 5,155
Hi, I'm reading a book on sets and it mentions a set B = {1,2,3,4} and it says that R3 = {(x, y) : x ∈ B ∧y ∈...
Apr28-14 08:56 AM
kingstar
3 468

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