# General Math

- Math topics not applicable to the categories below. High-school Math
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### Math FAQ

Common math questions, quality answers.
Jul24-14 10:02 AM Greg Bernhardt

### Math Challenges

Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed.
Aug5-14 02:05 PM fredoniahead

### Math Learning Materials

All math courses. PDFs, tutorials and web links.
Y 01:06 PM phion
 Meta Thread / Thread Starter Last Post Replies Views Views: 4,878 Announcement: Follow us on social media and spread the word about PF! Jan16-12 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 5 1,031 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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