Trouble with Late Friday Night Homework

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Homework Help Overview

The problem involves solving a first-order differential equation of the form y' = (1/2)(y - 1)² with the initial condition y(0) = 2. The original poster expresses confusion regarding their attempts to solve the equation, particularly after applying variable separation.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • The original poster attempts variable separation and integrating but is unsure why their approach did not yield the correct result. They express uncertainty about their algebra after integration. Some participants suggest checking the signs and offer to help with the algebra if it is shared.

Discussion Status

The discussion is ongoing, with participants providing guidance on the integration process and encouraging the original poster to revisit their work. There is acknowledgment of a typo in the original equation, which may have contributed to the confusion.

Contextual Notes

The original poster mentions the late timing of their homework as a potential factor in their difficulties. There is an indication that the algebraic manipulation after integration may be a point of error, but specifics are not yet resolved.

erok81
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Homework Statement



I have no clue why I am having trouble with this...late friday night homework maybe.

Solve: y'=\frac{1}{2}(y-1)^{2}
y(0)=2

Homework Equations



The Attempt at a Solution



I tried variable separation and integrating from there:

\frac{y'}{(y-1)^{2}}=\frac{1}{2}

I'm not sure why that didn't work, but I couldn't get the correct from that.Any ideas?
 
Last edited:
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Multiply both sides of that equation by dx and it should be a very simple integral... Just make sure you get all of your signs correct.

EDIT: Although the second equation should be (y-1) and not (y-2).
 
Oh yes, that was a typo - thank you

I'll give it another go. For some reason after integrating it didn't look right so I gave up too soon. I am pretty sure my error is in the algebra at the end. :redface:
 
erok81 said:
Oh yes, that was a typo - thank you

I'll give it another go. For some reason after integrating it didn't look right so I gave up too soon. I am pretty sure my error is in the algebra at the end. :redface:

If you show your algebra, I might be able to help you.
 

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