Use the chain rule to find the derivative

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Homework Help Overview

The problem involves finding the derivative of the function f(x) = ((x^2+2)^2)/(x+2)^(1/2) using the chain rule. The original poster expresses confusion regarding the solution provided in their textbook.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to apply the quotient rule before the chain rule, as the function is a quotient. There is also mention of an alternative approach using the product rule.

Discussion Status

Some participants have offered guidance on the appropriate rules to apply, suggesting a re-evaluation of the original approach. There is an acknowledgment of differing opinions on the best method to use, indicating a productive exploration of the problem.

Contextual Notes

There is a note regarding the appropriateness of the forum section for questions on derivatives, suggesting that this topic may be better suited for a different category within the forum.

Mathysics
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Homework Statement


f(x) = ((x^2+2)^2)/(x+2)^1/2
Use the chain rule to find the derivative

Homework Equations


None


The Attempt at a Solution


((x^2+2)^2)(x+2)^-1/2

PS: Answer in the book is 3x((x^2+2)^1/2)

I have no idea how they get it there, would like some help, thx!
 
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Mathysics said:

Homework Statement


f(x) = ((x^2+2)^2)/(x+2)^1/2
Use the chain rule to find the derivative

Homework Equations


None


The Attempt at a Solution


((x^2+2)^2)(x+2)^-1/2

PS: Answer in the book is 3x((x^2+2)^1/2)

I have no idea how they get it there, would like some help, thx!
It looks like you completely missed the fact that this is a quotient (use the quotient rule first). As part of using the quotient rule, you'll need the chain rule.
 


Mark44 said:
It looks like you completely missed the fact that this is a quotient (use the quotient rule first). As part of using the quotient rule, you'll need the chain rule.

ohh thx! I will try it again (reserved)
 


BTW, questions on derivatives really should go in the Calculus & Beyond section, not the Precalc section.
 


Or, since the product rule is (to me anyway) less complicated than the quotient rule, write your function as [itex]f(x) = (x^2+2)^2(x+2)^{-1/2}[/itex] and use the product rule, together with the chain rule.
 

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