When y is defined as a function of x

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Homework Help Overview

The discussion revolves around finding the derivative \(\frac{dy}{dx}\) for the equation \(y + e^y = x^2\), where \(y\) is defined as a function of \(x\). The problem involves implicit differentiation as a method to derive the relationship between \(y\) and \(x\).

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the use of implicit differentiation and question how to initiate the differentiation process. Some express uncertainty about starting the problem, while others suggest trying implicit differentiation to see what results.

Discussion Status

There is a progression in the discussion where participants explore the differentiation process. Guidance has been offered regarding the necessity of implicit differentiation, and some participants have begun to derive expressions for the derivative.

Contextual Notes

Participants express uncertainty about the initial steps in the differentiation process, indicating a need for clarification on the application of implicit differentiation in this context.

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Homework Statement



find [itex]\frac{dy}{dx}[/itex] when y is defined as a function of x by the equation
y+[itex]e^y = x^2[/itex]

Homework Equations





The Attempt at a Solution



hi all,
do i use implicit differentiation for this? I am not really sure how to start...
 
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rab-c said:

Homework Statement



find [itex]\frac{dy}{dx}[/itex] when y is defined as a function of x by the equation
y+[itex]e^y = x^2[/itex]

Homework Equations





The Attempt at a Solution



hi all,
do i use implicit differentiation for this? I am not really sure how to start...

Should you use implicit differentiation? Well, why don't you try it, to see what happens?

RGV
 


Differentiate both sides of the equation with respect to x. Since the y on the left side is an unknown function of x, yes, you will need to use implicit differentiation.

(But, as Ray Vickson implies, even if you were not sure, you should have tried. Much of mathematics is "try and see if it works".)
 


y'+[itex]e^y y'[/itex] = 2x
y'(1+[itex]e^y[/itex]) = 2x
y' = [itex]\frac{2x}{1+e^y}[/itex]
I think this is the right answer?
 

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