Second Derivative in Terms of Y

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SUMMARY

The discussion centers on finding the second derivative of the equation 4x^2 + 3x - 9y^2 in terms of y. Participants clarify that y must be treated as an implicit function of x, allowing for the application of implicit differentiation. The correct approach involves defining the equation as 4x^2 + 3x - 9y^2 = 0 and then using implicit differentiation to derive the first and second derivatives with respect to x. The confusion arises from the initial request to express the second derivative solely in terms of y without acknowledging the implicit relationship.

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  • Understanding of implicit differentiation
  • Familiarity with the chain rule in calculus
  • Knowledge of first and second derivatives
  • Basic algebraic manipulation skills
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  • Study implicit differentiation techniques in calculus
  • Learn about the chain rule and its applications
  • Practice finding second derivatives of implicit functions
  • Explore examples of multivariable calculus involving implicit functions
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Students studying calculus, particularly those focusing on implicit differentiation and multivariable functions, as well as educators seeking to clarify these concepts in teaching materials.

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Homework Statement


Find the second derivative of 4x^2 + 3x - 9y^2. Answer in terms of y.


Homework Equations


All derivative formulas.

The Attempt at a Solution


[PLAIN]http://http://i52.tinypic.com/2w2ptex.jpg

I can't get much further than this; the thing that gets me is how to put everything in terms of y. Help? Thanks!
 
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You can't. The problem you give makes no sense. If you have an equation like 4x^2+ 3x- 9y^2= 0 then y is defined as an "implicit" function of x and you can find the first and second derivatives of y with respect to x.

Or, if you have a function f(x,y)= 4x^2+ 3x- 9y^2 you can find the the second derivative of f with respect to y.

Please check and tell us what the problem really is.
 

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