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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 39,259
Struggling with this one How do you solve the equations of the form ax^4+bx^2+c=0
Jan29-05 05:49 PM
krab
1 930
Are there any general methods to solve the following complex exponential polynomial without relying on numerical...
Dec3-09 02:42 PM
Count Iblis
2 1,805
Hi, I've been trying to solve this equation for hours no, hoping somebody here can help. I have the equation: -2m2w3...
Apr2-10 02:30 PM
elect_eng
9 2,504
x3 - 12x + 1 = 0 How does one solve for x?
Nov20-09 05:14 AM
HallsofIvy
2 2,400
How does one find the roots of an equation, for instance: r^4 + r^3 - 7r^2 - r + 6 = 0 ...completely by hand. Is...
Mar5-06 06:51 PM
mathwonk
6 12,500
Hiya. Is anyone familiar with solving cubics? Currently, i am able to to solve cubics where q^2 - p^3>0 however, i...
Nov21-05 11:36 PM
mathwonk
10 3,728
Hello; This is not a homework question, but something I was wondering about solving difference equations. For...
Aug8-10 01:19 PM
FeDeX_LaTeX
7 5,253
Is there any software packages available to solve Differential equations(first order and second order)? This will be...
Apr27-11 06:55 AM
dalcde
5 1,263
Take for example a system of differential equations: dx/dt=f(x,y) dy/dt=g(x,y) If I plot the surfaces for f(x,y)...
Feb15-13 06:12 AM
Simon Bridge
3 730
Hello there, I am a mechanical engineer and am attempting to build an Excel document for calculations purposes. ...
Jul9-10 10:00 AM
Mentallic
4 855
Hello there, I need some help rearranging a combination of equations and was wondering if someone could help? I am...
Oct4-13 09:41 AM
CompuChip
3 697
need hint/help or perhaps a solution :smile: Equations are from Propeller Blade Theory. Im trying to figure out how...
Mar17-12 06:24 PM
D H
2 1,184
Hello, Okay, I have finally worked out a decent curve to work with which is in accordance with my previous post...
Dec14-12 04:04 PM
symbolipoint
15 1,249
how would i solve X=(Y+Z/N)^N?
Nov14-03 12:29 PM
dduardo
2 1,524
Hi, I have been trying to solve some mechanics problems and I can come up with the right equation, but I don't know...
Apr5-10 07:02 PM
Gerenuk
4 5,715
Hi I have an equation: tan(x) = sqrt(t/x + 1) t is a constant. How do I solve for x using Python and/or...
Mar5-12 06:13 AM
Avatrin
0 769
I was just wondering about solving equations like: f(g(x)) = h(j(x)) where each function would be written in some...
Aug19-11 04:00 PM
bfr
0 934
I am trying to solve an equation that involves substitution. I was given k= 7 in the equation n=k+c i was also...
Apr14-12 04:22 AM
Stephen Tashi
3 925
Are there general methods for solving equations of the form a+bx = mod(c+dx, m), where, in the notation I have...
Dec31-12 01:26 PM
mfb
7 1,053
I have an expected value problem where z is a desired expected value and I want to reach and x is an amount I can...
Feb6-14 10:23 AM
tlonist
0 361
We know how to solve problems like e^ax+e^bx=k, when a=2b. But how to solve equations of this type when a is not...
Apr17-11 11:48 AM
cloud360
2 1,530
There is one problem that I can't seem to figure out how to do, and I was wondering if someone could help me. Problem:...
Feb12-05 09:08 PM
dextercioby
2 2,554
Can anyone show me how to solve the following equations: 2^(x-1)-2^(x)=2^(-3) 3^(x+1)+3^(x)=36 I would greatly...
Sep21-08 08:39 PM
SnipedYou
2 1,122
Hello, The following problem is bothering me quite a bit. It is... Solve. 3 x 2^x = 12 The Unit this...
Jan19-04 11:10 AM
JDK
10 11,481
My confusion comes from basic exponent rules and whether or not both sides of an equation have to have the same level...
Mar30-14 05:23 PM
1MileCrash
3 381
Dear everyone. First of all Merry Xmas, when everybody gets to that. I have a problem solving for a factor...
Dec21-13 09:03 AM
scurty
6 508
Hey guys, this is a little silly question but it bothers me. Im not a math genius (yet i hope) and im still in...
Aug1-14 02:33 AM
Borek
10 378
How do I find solutions for an equation like: x(1+1/y)+((y**3)/x)-(x**2)(4/y)=(y/2)-y+(4)(y**4)-4 Another, less...
Sep13-11 08:07 AM
allo
6 2,579
sin( degtorad( (180 - (180 - 360/x))/2 ) ) = y/z degtorad(degrees) means the the degrees inside the parenthesis are...
Apr5-06 06:03 AM
HallsofIvy
4 6,302
I have an equation, where acceleration is affected by a driving power and air resistance. The acceleration is given...
Dec31-13 10:25 PM
NascentOxygen
7 654
Not really sure where this question belongs in this forum... I was solving an engineering problem and I got to the...
Mar23-14 07:15 AM
mfb
4 435
This is the first time ive used this forum and i really could use someones help on how to solve for C in my formula...
Sep7-04 06:02 AM
Ethereal
3 2,986
In an experiment I am performing, I observed the following: Result is directly proportional to A Result is...
Jul27-09 11:19 PM
EliteLegend
4 988
I'm having some trouble understanding how to solve for i. This is the formula for compounding intrest. I'm reading...
Oct23-07 08:31 AM
HallsofIvy
3 9,681
Sinθ=opp/hyp Sinθ=5/3 Sinθ=1.6 I know the answer is 35.87. I would like to convert 1.6 to 35.87 but am...
Sep4-14 06:58 PM
Mark44
5 224
Hi, I am stuck on even how to start to solve for T the equations is: 0 = Vi / K (1 - e^-kt)(sin theta) + (g /...
Apr15-03 07:40 AM
Matt Jacques
9 3,453
Say I have x^2 + 1 = 0 mod 7, it is clear that adding a linear polynomial congruent to 0 will give away the solution;...
Oct14-07 03:17 PM
mathwonk
3 1,422
I have a word problem with the equation being: h=1.55cos+2.7 Then it says let h=3.2, how do I solve...
Dec16-10 02:49 PM
HallsofIvy
4 2,599
Ok i know this should be a relatively simple equation but i haven't done this stuff in so long i can't remember how to...
Jan13-08 01:21 AM
olgranpappy
2 8,691
Hi, I have an equation: \frac{q-\bar{q}}{w_{i}^{2}+w'_{j}^2}=\sum^{n}_{i=0}\sum^{m}_{j=1}F_{0}\cdot a_{ij}\cdot...
May30-12 07:33 PM
sebasbri
2 1,004

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