Differential Equations Question

[JackJill]

dy/dx = x, what is y?

 

[ekta]

y={(x^2)/2} +C

 

[JackJill]

Can you tell me how you did that question? Are you sure it's correct.

 

[ekta]

dy=x dx
Integrate both sides

 

[JackJill]

And this is the answer to the initial differential equation right?

 

[bigbadwolf]

dy/dx = x, what is y?

This is a joke, right?

 

[ValueSeeker]

You must be joking

 

[Tsotne]

And this is the answer to the initial differential equation right?

If you are really serious (I hope) then it is the GENERAL answer to the diff equation given. If you are interested in particular solution then you must state (or be given) an initial condition in order to get the remaining C term(constant of integration) as a number.

 

[AlexandreH]

This must be a joke!!!!

 

[Tsotne]

This must be a joke!!!!

Ok people no need to say that. He/she might be a new quantitative student or even school pupil joining the forum community and asking a question. What if he doesn't joke and is seriously interested in it or intends to change his/her current job and move to quantitative side where he/she has to start from scratch. I have also been at some forum communities asking very simple question and have been given a serious answer regardless of how simple to the professionals the asked question was. I was writing a program and wanted to make an association on Java code, and I asked it on Java community. Should I have been given cynical answers?!

 

[AlexandreH]

Ok people no need to say that. He/she might be a new quantitative student or even school pupil joining the forum community and asking a question. What if he doesn't joke and is seriously interested in it or intends to change his/her current job and move to quantitative side where he/she has to start from scratch. I have also been at some forum communities asking very simple question and have been given a serious answer regardless of how simple to the professionals the asked question was. I was writing a program and wanted to make an association on Java code, and I asked it on Java community. Should I have been given cynical answers?!

Come on Tstone. Even this question can be asked on Google (http://www.google.com/search?client=safari&rls=en&q=dy/dx=x&ie=UTF-8&oe=UTF-8). Asking a Java question on a Java community is normal. Don't worry.

 

[Tsotne]

Ok whatever. No need to go on arguing. I agree with you in that, what first came to my mind after reading the first post in this thread was google

 

[D Serg]

I do agree that we should be friendly here, otherwise good people will leave this forum.

JackJill, regarding your question. Please check this web-site: http://www.wolframalpha.com/
It may handle differentiation, integrations, solve quadratic equations (and draw graphics), also it knows how to work with matrices and so on... you just need to figure out where tutorial is located and read it or just try to input your equation:

http://www.wolframalpha.com/input/?i=dy/dx = x

 

[AlexandreH]

I do agree that we should be friendly here, otherwise good people will leave this forum.

JackJill, regarding your question. Please check this web-site: http://www.wolframalpha.com/
It may handle differentiation, integrations, solve quadratic equations (and draw graphics), also it knows how to work with matrices and so on... you just need to figure out where tutorial is located and read it or just try to input your equation:

http://www.wolframalpha.com/input/?i=dy/dx = x

This is one useful website. Thank you @JackJill .

 

[Tsotne]

This is one useful website. Thank you @JackJill .

And its parent: http://mathworld.wolfram.com/

 

[ExSan]

http://www.wolframalpha.com/input/?i=dy+=+x+dx

 

[Daniel Duffy]

dy=x dx
Integrate both sides

Can't do

 

[MRoss]

This is one useful website. Thank you @JackJill .

Alex you are a riot.