Vinicius L. Beserra
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  • 0 posts edited
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  • 103 votes cast
Apr
23
awarded  Curious
Apr
22
asked Linear differential equation
Apr
21
comment What is the tip for this exact differential equation?
Sorry. I know that u have made use of change of variable. I understood partially the solution but. For this reason I asked u if some steps where hidden. I can see that u derivate in second line d(y/x). What does LHS and RHS mean?Where´s the original expression? How did u get the 4th line?
Apr
21
comment What is the tip for this exact differential equation?
Sorry. I know that u have made use of change of variable. I understood partially the solution but. For this reason I asked u if some steps where hidden. Thanks
Apr
20
comment What is the tip for this exact differential equation?
Did your hide some steps?
Apr
20
comment What is the tip for this exact differential equation?
Thanks for the helpe, but I need detailed explanation.
Apr
20
awarded  Custodian
Apr
20
comment What is the tip for this exact differential equation?
(x^3+xy^2+y)dx= M and N= (x^2y+y^3−x)dy
Apr
20
reviewed Approve What is the tip for this exact differential equation?
Apr
20
asked What is the tip for this exact differential equation?
Apr
6
comment How do I find a formulae for $S_n$ for the sequence 3/16, 3/64,3/256, 3/1024?
The answer is 4^(n)-1/4^(n+1)
Apr
5
asked How do I find a formulae for $S_n$ for the sequence 3/16, 3/64,3/256, 3/1024?
Mar
20
comment Help with this differential equation
Thanks Frieder.
Mar
17
comment Help with this differential equation
Thanks Frieder. Have you got the book or any site where I can see the solution step by step. It´s because we learn here in other way. In fact your answer is right, but I don´t understand how do you eliminate the natural log in both sides of the equation and how do you find the last line of this expression. \begin{array}{l} (x - 2y + 5){\rm{dx}} = u(1 - 2){\mathop{\rm du}\nolimits} \\ (2x - y + 4){\rm{dy}} = ut(2 - t)du + (2 - t){u^2}dt\\ (1 - {t^2}){\mathop{\rm du}\nolimits} + (2 - t)u{\mathop{\rm dt}\nolimits} = 0 \end{array}
Mar
16
accepted Help with this differential equation
Mar
16
asked Help with this differential equation
Mar
9
comment Solving a differential equation with involving $e$
Thanks Lucian, but in fact I would like someone unmark my question as -1.
Mar
7
comment Solving a differential equation with involving $e$
As I said before I didn´t misspelled the original funcion. It is as in the book.
Mar
5
comment Solving a differential equation with involving $e$
No, I didn´t mispelled the equation. In the book it is as I posted here.
Mar
4
comment Solving a differential equation with involving $e$
y=-x Lg*lg*(C/x)