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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.
Sep15-14 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 39,255
For example; Please tell me which are false and true. If false explain why, don't just say because so and so...
Y 09:13 PM
FactChecker
7 210
- - -
In the classic proof of irrationality of SQRT(2) we assume that it can be represented by a rational number,a/b where...
Y 07:27 PM
CKH
6 221
Hey! I was wondering, is it a bad idea to solve a math problem mentally instead of writing it down? I recently got...
Y 12:21 AM
homeomorphic
9 270
- - -
3 + 7i < 5 Is that a valid statement? Would that be taking the magnitude of 3 + 7i and comparing that to the...
Sep15-14 09:02 PM
Curious3141
10 242
Is there an intuitive reason or proof demonstrating that in general dimensions, there is no direct analogue of the...
Sep15-14 04:17 PM
pwsnafu
5 210
So look at what Ive done: {n+1 \choose k} = \frac {(n+1)!} {(n+1-k)! \cdot k!} = \frac {(n+1)\cdot...
Sep14-14 08:35 PM
Mentallic
3 179
Somebody can give me some tips? I'm really bad at this.
Sep14-14 07:53 PM
Dnomyar
4 230
Hello everyone! I am a new member of this forum and this is my first post. At the moment, I am looking for the...
Sep14-14 08:00 AM
Mentallic
4 216
I've just noticed that i have a fundamental lack of understanding in a specific aspect of math, and I can't find where...
Sep14-14 07:54 AM
HallsofIvy
3 193
I know that by definition, a/(b/c)= a x 1(b/c)....but from there I am lost. Help please!
Sep13-14 09:57 PM
CKH
4 234
From the Intermediate Value Theorem, is it guaranteed that there is a root of the given equation in the given...
Sep13-14 01:27 PM
gopher_p
3 158
I've been thinking about this for some time. Now I'm coming on here in the hope of getting some help; Prove that...
Sep13-14 09:48 AM
Sheepwall
6 240
I have a simple question that probably has a complicated answer. How do I prove theorems? Like, prove that the square...
Sep13-14 05:40 AM
disregardthat
4 225
Hi everyone, I recently began a grad program and we have started taking a course in stochastic methods. However I...
Sep12-14 07:56 PM
caveman1917
13 472
The general equation of a parabola is: (y - y1) = A(x - x1)^2 A is the scaling factor y1 is the y coordinate of a...
Sep12-14 03:32 PM
kevinshen18
5 268
The reason I have that in quotes is because by definition, elements in a set must be unique, and there is no concept...
Sep12-14 02:26 PM
WWGD
3 214
Dear All My water tank fixed on roof top 5M from the ground Height of tank 1m width of tank .75m ( Cylinder...
Sep11-14 03:43 PM
SSWheels
11 1,658
Guys, I have a problem I'm trying to solve for work (we're trying to inspect a hole, and I'm trying to determine...
Sep11-14 10:11 AM
SSWheels
6 1,348
x + 0 = x x - 0 = x x(0) = 0 x(0) = undefined ...is this how you call it or is it no solution? x^0 = ??? ...
Sep11-14 09:24 AM
HallsofIvy
10 403
Without any rough work
Sep11-14 01:20 AM
willem2
15 419
How to solve this: log(base16)x + log(base4)x + log(base2)x = 7 If I have log(base16)x for example and i make ...
Sep10-14 06:53 PM
Integral
2 263
Hi, can't solve following prob: Let a, b and c be real numbers. Given that a^2, b^2 and c^2 are in arithmetic...
Sep10-14 12:48 PM
willem2
2 245
Ok so for the problem i'm mainly having trouble with setting up one of the equations. The solutions manual jumped...
Sep9-14 07:30 PM
gopher_p
3 339
Hi, Mathematica is telling me the value of this series, but I can't figure out how to do it on paper. Can someone...
Sep9-14 07:07 PM
WWGD
3 262
Is the tangents function tan(x) continuous when x = 90 degrees or x = pi/2?
Sep9-14 03:01 PM
caveman1917
16 434
Hi all, I should start by saying I'm an amateur at mathematics so please excuse me if the question seems a bit...
Sep9-14 12:13 PM
jedishrfu
7 441
Full title: Relationship between the constructibility of regular polygons and the reducability of trigonometric...
Sep9-14 08:35 AM
...
0 248
I show that the assoc. property applies to addition and multiplication in my book: (a+b)+c = a+(b+c) (ab)c = a(bc)...
Sep9-14 07:44 AM
HallsofIvy
4 238
For proving this equation: \delta (g(x)) = \sum _{ a,\\ g(a)=0,\\ { g }^{ ' }(a)\neq 0 }^{ }{ \frac { \delta...
Sep9-14 07:07 AM
PaulDirac
1 210
Hi, I'm not the best with algebra and I've been wrestling with a formula this afternoon. It is a formula to calculate...
Sep8-14 11:54 PM
wallybanger
9 364
(e^{1+i*2*pi})^{1+i*2*pi}=e^{(1+i*2*pi)(1+i*2*pi)} why is this false (according to Wolfram Alpha) ?
Sep8-14 07:32 PM
WWGD
3 293
Can anyone help me set this problem up? I am trying to figure out how to Prove the Sander's Parallelogram. See...
Sep8-14 02:56 PM
MrAnchovy
2 248
I only see positive factors in my book. Example: 2 and 2 are factors of 4. But aren't -2 and -2? Is there some...
Sep8-14 08:15 AM
PeroK
1 272
A=12^(1/5) Log(A)=(1/5)Log(12) The next part in the book says: Log(A)=0.2158 A=1.644 I don't know how to do...
Sep7-14 01:47 PM
Zaent
3 240
I'm trying to check my understanding of rotations in the complex plane. Do I have any of this wrong? If so, can you...
Sep7-14 01:43 PM
DiracPool
2 223
This is frustrating me. The formula for division of fractions in my Pre-Calculus book is a/b = a x 1/b. ...
Sep7-14 01:28 PM
DiracPool
2 283
Any ideas?
Sep7-14 12:02 PM
mizen
17 428
I've noticed that the vast majority of named or important mathematical constants, are what you might call small...
Sep7-14 11:14 AM
Boorglar
7 286

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