End of differential equation, quick alegbra Q

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Homework Help Overview

The discussion revolves around solving for \( y \) from an implicit solution of a differential equation, specifically \( \frac{y}{\sqrt{1+y^2}} = x^3 + C \), where \( C \) is an arbitrary constant.

Discussion Character

  • Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to isolate \( y \) from the implicit solution but encounters difficulties with the algebra involved. Some participants suggest squaring both sides and manipulating the equation to solve for \( y^2 \).

Discussion Status

Participants are actively engaging with the algebraic manipulation of the equation. Some have provided steps that could lead to a solution, but there is no explicit consensus on the best approach yet.

Contextual Notes

There may be constraints related to the original problem setup or assumptions about the values of \( C \) and \( x \) that are not fully explored in the discussion.

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Homework Statement


I just solved a differential equation and got the problem down to its implicit solution:
y/√(1+y2) = x3+C where C is an arbitrary constant
My question now is, how can I solve for y? I can't get past the algebra. Thanks!


Homework Equations





The Attempt at a Solution

 
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Square both sides. Solve for y^2. Take a square root. Come on. Try it.
 
Square both sides and bring the bottom part to the other side. You'll get

y^2 = (1+y^2)(x^3 + c)^2

Then multiply out and regroup.

y^2 -y^2(x^3 + c)^2 = (x^3 + c)^2

then you'll get y^2 = \frac{(x^3+c)^2}{1-(x^3+c)^2}

So y = \sqrt{\frac{(x^3+c)^2}{1-(x^3+c)^2}}
 
thank you!
 

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