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April 17, 2014

Search: math- differential equations

Number of results: 220,896

Math
A two population model is satisfied by a system of differential equations given by, V(x,y) = (ax,by)^T The general solution of the system of differential equations has x = Še^at for some constant Š. The parameter t can be eliminated and we can express y in terms of x in the ...
Saturday, August 25, 2012 at 3:10am by Anonymous

techhelp ASAP
You may be looking for "differential formulas" or "differential equations".
Saturday, October 26, 2013 at 12:49am by DrBob222

differential equations
solve the differential equation by seperation of variables 5. y'=xy/2ln y
Thursday, March 17, 2011 at 7:24pm by cathy

Differential Equations
Solve the seperable differential equation for U. du/dt = e^(5u+7t) - Using the following initial condition U(0) = 12
Saturday, August 27, 2011 at 1:55pm by Kody

Differential Equations
Solve the differential equation below with initial conditions. Compute the first 6 coefficient. Find the general pattern. (1-x)y"-y'+xy=0 y(0)=1, y'(0)=1
Monday, July 9, 2012 at 5:26pm by Jason

Differential Equation
Hello everyone. I was wondering if anyone knows a site that could help me with the homework free online...with Differential equations. it would be great. I need help on in big time thank you
Wednesday, October 22, 2008 at 10:24am by mary

Differential Equations!
I'm struggling solving this separable differential equations: (du/dv) = ((uv+u)/(uv+v)) I multiplied both sides by dv to get on the left side just du and cancel out dv, but after that don't know where to go. I've tried integration by parts but it doesn't look right! Any help ...
Sunday, January 13, 2013 at 12:23am by Massiel

calculus
is y = x^3 a solution to the differential equation xy'-3y=0?? how do i go about solving this??? also, is there a trick to understanding differential equations? i'm really struggling with this idea, but i'm too embarassed to ask my professor for help.
Monday, December 1, 2008 at 9:10pm by Kenneth

differential equations
Consider the 2nd order differential equation: x''(t)=-x-A(x^2-1)x'(t) x(0)= 0.5 x'0)= 0 ''= 2nd order,'= 1st order where A is a positive constant.As the value of A increases this equation becomes increasingly stiff. Convert this equation to two first-order equations. please ...
Wednesday, November 16, 2011 at 12:23pm by Rikki

Differential Equation
http://www.amazon.com/Schaums-Outline-Differential-Equations-Outlines/dp/0071456872 This is a really inexpensive book, very well done with solved problems. Take a look at it at the college bookstore, or BarnesNoble. Then you can buy it even at amazon. This book is great.
Wednesday, October 22, 2008 at 10:24am by bobpursley

Math
I need to solve this set of differential equations {y'+(t/2)1, y(0)=1} and then find the limiting value as t approaches infinity. I'm not sure where to start. I found the answer to the differential equation to be: y(t)=e^-t^2/4[e^(r^2/4)dr +Ce^(-t^2/4)where the [ sign ...
Thursday, September 6, 2012 at 8:57pm by Emily

Differential Equation
wolframalpha . com will solve differential equations, and show the steps used getting there. just type "solve t^2y"-3ty'+4y=0" and watch the fun.
Saturday, July 14, 2012 at 12:43am by Steve

math- differential equations
ok thanks
Friday, September 7, 2007 at 7:23pm by manny

math
It is important to know rates of change in many fields. Derivatives appear often in physics and engineering. Accurate predictions are made using equations that employ derivatives. They are called differential equations.
Saturday, August 21, 2010 at 3:29am by drwls

Differential Equations
Find the general solution of the differential equation specified. 1) dy/dt= 1/(ty+1+y+1) 2) dy/dx=sec y I got y(x)=arcsin(x) for the second one. I'm not sure what to do with the first one.
Tuesday, January 22, 2013 at 10:14pm by Erica

math/physics
how would you solve it with differential equations
Saturday, November 8, 2008 at 10:50pm by cyrus

Differential Equations
A rabbit starts at the origin and runs up the right branch of the parabola y=x^2 with speed a. At the same time a dog, running with speed b, starts at the point (c,0) and pursues the rabbit. Write a differential equation for the path of the dog
Thursday, January 26, 2012 at 7:41pm by Samantha

Differential Equations
Consider the differential equation: dy/dt=y/t^2 a) Show that the constant function y1(t)=0 is a solution. b)Show that there are infinitely many other functions that satisfy the differential equation, that agree with this solution when t<=0, but that are nonzero when t>0...
Thursday, January 31, 2013 at 12:35am by Erica

Differential Equations
Consider the differential equation: dy/dt=y/t^2 a) Show that the constant function y1(t)=0 is a solution. b)Show that there are infinitely many other functions that satisfy the differential equation, that agree with this solution when t<=0, but that are nonzero when t>0...
Thursday, January 31, 2013 at 3:41pm by Erica

Ap Calculus
Ok, I've been doing BC review tests to prepare for the AP exam. I came across this free response problem and I have no idea how to do it, can someone please help me with this? It gives the differential equations: dP/dt = .03P(30-P) and it asks "Find the general solution to the...
Wednesday, April 25, 2007 at 1:41pm by Jessica

Calculus
Solve the differential equations
Thursday, February 20, 2014 at 10:20pm by Anonymous

calculus-differential equation
Consider the differential equation: (du/dt)=-u^2(t^3-t) a) Find the general solution to the above differential equation. (Write the answer in a form such that its numerator is 1 and its integration constant is C). u=? b) Find the particular solution of the above differential ...
Tuesday, February 5, 2008 at 5:19pm by Jeff

Differential Equations
Consider the differential equation: dy/dt=y/t^2 a) Show that the constant function y1(t)=0 is a solution. b)Show that there are infinitely many other functions that satisfy the differential equation, that agree with this solution when t<=0, but that are nonzero when t>0...
Thursday, January 31, 2013 at 11:46am by Erica

calculus
from http://www.mathscoop.com/calculus/differential-equations/euler-method-calculator.php
Saturday, March 9, 2013 at 2:06pm by Damon

differential equation
This is and ordinary differential equation with exact roots. What I suggest to review these is to go to Barnes Noble, or any good bookstore, and purchase Schaum's Outline Series, Differential Equations, an excellent book and buy. Take a look. There is an abridged version ...
Monday, August 11, 2008 at 1:52pm by bobpursley

Differential Equations
There is no y(0) givien, so I'm not sure how to go from there.
Monday, November 25, 2013 at 3:06pm by Emily

Differential Equations
The velocity v of a freefalling skydiver is well modeled by the differential equation m*dv/dt=mg-kv^2 where m is the mass of the skydiver, g is the gravitational constant, and k is the drag coefficient determined by the position of the driver during the dive. (a)Find the ...
Thursday, January 24, 2013 at 12:58am by Erica

Math: Differential Equations
dy/y = x secx dx I don't think x secx can be done in elementary functions
Wednesday, January 15, 2014 at 11:47pm by Steve

math- differential equations
hello i am retada and i love u
Friday, September 7, 2007 at 7:23pm by retada

Differential Equations
This didn't help me much bobpursley, I am just so confused.
Tuesday, August 31, 2010 at 5:04pm by anonymous

differential equations
lny dy/y= xdx (ln y)^2= x^2 + C
Thursday, March 17, 2011 at 7:24pm by bobpursley

differential equations
dy/dx=(9+20 x)/(xy^2)
Wednesday, October 8, 2008 at 3:03pm by James

Calculus
can you solve it by using separation of differential equations
Sunday, September 9, 2012 at 11:55pm by Tyler

Differential Equations
Find the eigenvalues and eigenfunction for the BVP: y ' ' '+ λ2 y ' = 0 , y(0) = 0, yí(0) = 0 and yí(L) = 0
Sunday, April 22, 2012 at 7:11pm by Chuck

Math
Are the differential equations separable or not? 1. y'= ye^(x+y) 2. y'= ye^(xy) 3. y'= y(xcos(y)) If they are, could you show how? Any help, even on one, would be extremely appreciated!
Wednesday, February 2, 2011 at 10:19pm by Leah

Differential Equations
oh, never mind. I've seen my mistake. disregard this question.
Tuesday, September 25, 2012 at 3:05am by Bryant

Differential Equations
If y(t) depends on what C is, then how this equation doesn't contradict the uniqueness theorem if it has many solutions?
Thursday, January 31, 2013 at 3:41pm by Erica

calculus
since Euler's method is used for differential equations, do you mean y' = x+y^2 y(0) = 0 ?
Sunday, November 10, 2013 at 9:45pm by Steve

Math: Differential Equations
I've been stuck on this math hw problem for a while, I was thinking of taking the integral of the equation, but I've been messing up too much that I'm not sure anymore. Q: Is it possible to solve y'=x/(x^(2)-1) for y(1) = 0? Thank you!
Wednesday, January 15, 2014 at 11:47pm by Student

exact differential equation
Steve and I disagree on a couple of terms. He could be right. My math is rusty. Check the math yourself. There are some good tutorials on the "exact differential" method online.
Friday, October 7, 2011 at 7:15am by drwls

Math: Differential Equations
Woops, wrong problem. The problem I need help is actually: Q: Is it possible to solve the equation y'=(xy)/(cosx) for y(0)=1? Sorry about that!
Wednesday, January 15, 2014 at 11:47pm by Student

calculus
Can you give me a good website on the topic, slope fields and differential equations? I need to match six slope fields with the correct differential equation. 1. dy/dx=x-y 2. dy/dx=1+x 3. dy/dx=cosx 4. dy/dx=2x 5. dy/dx=x+y 6. dy/dx=y(2-y)
Wednesday, November 7, 2007 at 12:27am by Anonymous

Differential equations
Use separation of variables. Integrate dt = h^2/(1-0.01h^2) dh with h = 0 at t = 0
Thursday, August 4, 2011 at 10:25pm by drwls

maths-urgently needed[Differential equations]
solve- dy/dx = 2xy + (y^2/x^2)
Thursday, February 7, 2013 at 6:16am by Anonymous

maths-urgently needed[Differential equations]
solve- dy/dx = 2xy + (y^2/x^2)
Thursday, February 7, 2013 at 10:13am by Anonymous

Differential Equations
y'=2x+y. Find a solution whose graph is also an isocline.
Thursday, February 14, 2013 at 1:59pm by Brian

maths-urgently needed[Differential equations]
Solution: {y[x] == (E^x^2 x)/(E^x^2 - Sqrt[Pi] x Erfi[x] + x Subscript[c, 1])}
Thursday, February 7, 2013 at 6:16am by Dr. Fairman

calculus
solve the differential equations subject to the given conditions. dy/dx= 4x^1/2 y=21 of x=4 is this derivative?!
Saturday, July 21, 2012 at 9:29pm by Anonymous

Differential Equations
".. by making many small deposits throughout the year. " I don't know what you mean by that. - how often are they made ? - are the payments the same ?
Tuesday, March 4, 2014 at 10:28pm by Reiny

differential equations
dy/dx=4x/y..verify that the straight lines y=2x are solution curves, provided x doesnt equal 0.
Wednesday, January 9, 2013 at 7:49pm by siddh

Math: Differential Equations
I'm given y''= sin(x) with the initial conditions of y(0)=0 and y'(0)=2. I've already taken the integral two times to get an answer of y= -sin(x)+3x, however, I'm stuck as to how to make this equation in terms of x=... Please explain, I'd really appreciate it!
Tuesday, January 14, 2014 at 11:09pm by Student

Calculus
Integrate e^(-x^2/2) dx What branch of calculus is this? Is this differential equations?
Friday, March 7, 2008 at 8:40pm by mathstudent

Calculus
Are the following differential equations separable or not? * y'= ye^(x+y) * y'= ye^(xy) * y'= y(xcos(y)) I am no good at these :[
Wednesday, February 2, 2011 at 8:22pm by Grace

maths-urgently needed[Differential equations]
Use wolframalpha dot com - it will solve yr equation and show all steps.
Thursday, February 7, 2013 at 10:13am by Dr. Fairman

Differential Equations
Use the Laplace Transform to solve this initial value problem. y'''' - 8y = 0, y'(0)=63, y''(0)=216, y'''(0)=297 I would really appreciate the help.
Monday, November 25, 2013 at 3:06pm by Emily

Differential Equations
a) Sketch the phase line for the differential equation dy/dt=1/((y-2)(y+1)) and discuss the behavior of the solution with initial condition y(0)=1/2 b) Apply analytic techniques to the initial-value problem dy/dt=1/((y-2)(y+1))), y(0)=1/2 and compare your results with your ...
Sunday, February 3, 2013 at 4:53pm by Erica

Differential Equations (Another) Cont.
For the following initial value problem: dy/dt=1/((y+1)(t-2)) a)Find a formula for the solution. b) State the domain of definition of the solution. c) Describe what happens to the solution as it approaches the limit of its domain of definition. Why can't the solution be ...
Thursday, January 31, 2013 at 11:55am by Erica

math-differential equations
hi i need to know how to do this one thanks Find the solution to yx + x + (dy/dx) = 0 ; y(9) = -9 y = ???? Does this separate the variables? dy/dx=-x(y+1) dy/(y+1) = -x dx
Sunday, August 5, 2007 at 10:52pm by kayla

University, Engineering Math
solve the ffg. differential equations: 1. x^3 +(y+1)^2 dy/dx=0 2. dy/dx-(1+1/x)y=y^2 3. dy/dx + ytanx=y^3sec^4x
Tuesday, February 5, 2013 at 10:27am by Taldil

Calculus Please help!
The differential of the function y=(x^2+6)^3 is dy=______dx. When x=2 and dx=0.05, the differential dy=_______? A) dy=______dx? B) the differential dy=_______?
Friday, February 28, 2014 at 8:19pm by ALI

Differential Equations
a) Sketch the phase line for the differential equation dy/dt=1/((y-2)(y+1)) and discuss the behavior of the solution with initial condition y(0)=1/2 b) Apply analytic techniques to the initial-value problem dy/dt=1/((y-2)(y+1))), y(0)=1/2 and compare your results with your ...
Sunday, February 3, 2013 at 1:37am by Erica

Calculus AB
Verify if the given equations are solutions to the differential equation. dy/dt=k(y-a) i) y=1-ae^(kt) ii) y=a+Ce^(kt)
Monday, February 28, 2011 at 11:21pm by dyingincalc

math
a bank account earns 7% annual interest compounded continuously. you deposit $10,000 in the account, and withdraw money continuously from the account at a rate of $1000 per year. a. write the differential equation for the balance, B, in the account after t years b. what is the...
Monday, March 14, 2011 at 5:04pm by Anonymous

Math
Do you mean dependent of independent equations? It depends upon how many equations and variables there are. If any of the equations are dependent on (derivable from) others, and there are at least as many variables as equations, then the system of equations in underdetermined ...
Tuesday, June 3, 2008 at 4:00pm by drwls

DIFFERENTIAL EQUATION
find the differential equation of family of lines with slope and y intercept equal.
Saturday, June 16, 2012 at 4:37am by JAJA111111

Differential Equations
Because the general solution contains an an arbitrary constant C. The value of C depends on your boundary conditions, for example if y =5 at t = 2 then 5 = C e^-(1/2) 5 = C (.606) C = 8.24 NOW your solution is unique.
Thursday, January 31, 2013 at 3:41pm by Damon

Differenctial equations
Use the change of variable x = exp(s) to recast the differential equation xy′′+y′+(L/x)y=0 Please HELP ME
Friday, October 14, 2011 at 5:12pm by lili

math numerical methods
Consider the following second order differential equation: y"-2x^(2)y+y^(3)=17cos(4x) with y(0)=4 , y'(0)=-9 If we let u=y and v=y′ then as an AUTONOMOUS first order system, the second order differential equation is correctly expressed as:
Sunday, April 21, 2013 at 3:06am by mahdi

Calc 2 college
Modeling with differential equations. If a bacteria culture doubles every 10 minutes and the original culture has 300 cells determine the rate of growth.
Friday, July 9, 2010 at 7:53pm by Marianne

calculus differential equation
Find in implicit form the general solution of differential equation dy/dx=2(e^x-e^-x)/y^2(e^x+e^-x)^4 with (y>0). I know this requires a seperation of variables but I beyond that I am confused by how.Thanks.
Saturday, February 12, 2011 at 12:52pm by malcolm

calculus differential equation
Find in implicit form the general solution of differential equation dy/dx=2(e^x-e^-x)/y^2(e^x+e^-x)^4 with (y>0). I know this requires a seperation of variables but I beyond that I am confused by how.Thanks.
Saturday, February 12, 2011 at 12:53pm by malcolm

Differential Equations
Solve dy/dx = y/(2y-x) using rational substitution (using v=y/x) with the initial condition y(0)=1. I solved this problem and found C (the constant) to be undefined. That is not the correct answer.
Saturday, February 15, 2014 at 4:59pm by Liz

Math
a weight of mass m is attached to a spring and oscillates with simple harmonic motion. By Hooke's Law, the vertical displacement, y(t) satisfies the differential equation dy/dt=sqrt(k/m)*sqrt(A^2-y^2) where A(Fixed) is the maximum displacement and k is a constant, solve this ...
Saturday, December 15, 2012 at 8:00pm by A.J.

Calculus
I remember when I considered taking a course on solving differential equations using FORTRAN. When I saw that I knew nothing about FORTRAN, I shelved that idea! However, if you already know some C++, you might be able to swing it, but as a math major who went on for a MS in ...
Tuesday, January 3, 2012 at 9:26pm by Steve

math
What is the name for the partial differential symbol (∂)? I see some papers use greek lowercase delta instead (δ) where I believe they are implying a partial differential. Is this normal? Is there supposed to be a conceptual difference between the two symbols? Or is...
Friday, February 6, 2009 at 3:03pm by anonymous

math (differential equation)
show that y sub n=cos(ncos^-1(x)) satisfies the differential equation: (1-x^2)(d^2y/dx^2)-x(dy/dx)+n^2(dy/dx)=0
Sunday, March 3, 2013 at 4:53pm by shoosh

Differential Equations
dy/y = dt/t^2 ln y = -1/t + c y = e^(-1/t+c) = e^c e^(-1/t) =C e^(-1/t) agree C can be anything so what if C = 0 ? then y(t) = 0 for all t if C = 0 for t</= 0 then C can be anything at all for t>0
Thursday, January 31, 2013 at 3:41pm by Damon

Differential Equations
solve using variation of parameters: y"+36y=[csc(6t)]^2 I don't understand variation of parameters very well at all.
Tuesday, April 24, 2012 at 9:34pm by Rosy

differential equations
Take the example of a differential equation: Since the differential equation in question has not been posted, I will work with an example. y"-2y'+2y=e2x.....(1) The solution yh to the homogeneous equation y"-2y'+2y=0 .... (2) is yh=C1*ex+C2*x*ex Note the two integration ...
Tuesday, February 15, 2011 at 3:01am by MathMate

math- differential equations
(1 + x)dy/dx - xy = x + x^2 ---> y' - x/(1+x) y = x First solve the homogeneous part of the equation: y_h' - x/(1+x) y_h =0 ---> y_h = A exp(x)/(1+x) Then you promote A from a constant to a function of x and put: y = A(x) Exp(x)/(1+x) If you subsitute this in the ...
Friday, September 7, 2007 at 7:23pm by Count Iblis

Math: Differential Equations
if y'' = sinx then y' = -cosx + c given : 2= -cos0 + c 2 = -1 + c c = 3 y' = -cosx + 3 y = -sinx + 3x + k given: 0 = =sin0 + 0 + k 0 = 0 + 0 + k --> k = 0 y = -sinx + 3x you had that, you are done! you have it expressed in terms of x
Tuesday, January 14, 2014 at 11:09pm by Reiny

math
10. Sales of televisions grow at a rate proportional to the amount present (t is measured in days). (a)Set up a differential equation to model this problem. (b)Solve the differential equation if at t = 0, there are 20 televisions sold and after 3 days, 500televisions are sold.
Thursday, May 31, 2007 at 8:06pm by dougal

Differential equations
Feel free to post your solution for confirmation. Since this is an initial value problem, the answer should be free of constants. Hint: this is a special kind called the Bernoulli equation.
Tuesday, February 15, 2011 at 6:17pm by MathMate

psychology
What is the difference between absolute continuity and differential continuity? Do an individualís experiences impact differential continuity?
Tuesday, July 28, 2009 at 8:18pm by Anonymous

Equation
That is not a differential equation. It merely defines a particular function Y(x) If it were a differential equation, it would contain a derivative of Y(x)
Saturday, June 16, 2012 at 3:00am by drwls

physics
The answers are correct. In the last part, your answer does not depend on your choice for g. If you leave it undetermined it will factor out of your equations. I think you should practice a bit with more complicated problems. I think that you get bogged down a bit too much in ...
Tuesday, July 14, 2009 at 7:23pm by Count Iblis

Differential equation
I noticed your equations when you posted them several days ago. I do not see how they can be solved by separation of variables. There are too many terms that involve both x and y. Both problems are too difficult for me to find a closed-form solution.
Monday, November 24, 2008 at 9:35am by drwls

math
Let y = tan(5x+2). Find the differential dy when x = 2 and dx = 0.4 Find the differential dy when x = 2 and dx = 0.8
Wednesday, March 28, 2012 at 10:13pm by bobby

MATH
Solve the differential equations? (calculus) a) square root cotany/ (1+x^2)sin^5y dy/dx = e^x^3 +3x/ square root cotany b) y^2/cosx dy = e^sinx/ e^y^3-1 dx
Wednesday, May 8, 2013 at 7:58pm by RAY

physics
Write and solve separate differential equations for the x and y coordinates, during the rocket firing. You will end up with separate equations for x and y. Once you have those functions, try to write y as a function of x. The Vx velocity component will remain 12 m/s. That ...
Monday, November 23, 2009 at 9:19am by drwls

Math
Find the specific solution for the following differential equations: a) (dy/dx)^2 - x^4 = 0 given the initial value y(1) = 0 b) dy/dx = ysinx given the initial value y(pi) = 1
Sunday, November 9, 2008 at 4:54pm by Alice

Math 116
Consider the following system of equations. y=2x-2 y-2x=9 What can you conclude about the system of equations? a. The system of equations is inconsistent. b. The system of equations is dependent. c. The system of equations is independent. d. none of these.
Friday, June 21, 2013 at 12:19am by Queta

maths
a web search on second order partial differential equations polar coordinates will turn up several useful articles on the Laplace operator in polar coordinates.
Saturday, February 11, 2012 at 1:14pm by Steve

calculus
verify that y=c/x^2 is a general solution of the differential equation y'+(2/x) y=0-6y=0 then find a particular solution of the differential equation that satisfies the side condition y(1)=2
Tuesday, April 10, 2012 at 11:40am by mari

calc
I will assume you mean (1/2)x and not 1/(2x)in the differential equation dy/dx = m, so we require that m = x/2 + mx+ b -1 This is true if m = -1/2 and b = 1+m = 1/2 y = -x/2 + 1/2 is a solution, but not the only solution, to the differential equation.
Thursday, January 24, 2008 at 4:24pm by drwls

AB Calculus
So I'm supposed to verify the solution of the differential equation. The solution is y=e^(-x). The differential equation is 3y' + 4y = e^(-x). What is the problem asking me to do here?
Monday, February 27, 2012 at 12:07pm by Hannah

Calc 2
Differential equations. There are gophers in a very large vacant lot. The original population is 30 Gophers. After 2 months there are 38. When will there be 45 gophers? round answer to nearest tenth of a month
Friday, July 9, 2010 at 9:19pm by Scott

college differential equations
Find two linearly independent power series solutions to the diffrential equation. State the first 3 therms of each series: 2x^2y''+xy'-(1+2x^2)y=0
Wednesday, July 28, 2010 at 11:09am by Justin

Math 1
Consider the following system of equations. y = 4x - 4 y - 4x = 3 What can you conclude about the system of equations? A) The system of equations is inconsistent. B) The system of equations is dependent. C) The system of equations is independent. D) none of these
Sunday, October 20, 2013 at 9:31pm by sam

psy
Can you please help me get some datas, to help me answer this question. What is the difference between absolute continuity and differential continuity? Do an individual's experiences impact differential continuity? Provide specific examples.
Tuesday, November 11, 2008 at 8:22pm by rose - Ms. Sue

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