Help with complicated integral, simplifying

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Homework Help Overview

The discussion revolves around the integration of the expression \(\int\sqrt{4x^{6}+16x^{2}}\,dx\) over the interval from 1 to 3. The problem falls under the subject area of calculus, specifically focusing on integration techniques and simplification of integrals involving square roots.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts a substitution by letting \(y = x^2\) to simplify the integral but struggles with the integration process. Other participants suggest rewriting the integrand and applying a different substitution, but there is uncertainty about how to proceed with the integration of the resulting expression. Questions arise regarding familiarity with hyperbolic functions as a potential method for integration.

Discussion Status

The discussion is ongoing, with participants exploring different approaches to the integral. Some guidance has been offered regarding substitutions, but there is no consensus on how to effectively integrate the expression. The original poster expresses confusion about integrating square roots, indicating that the discussion is still in a formative stage.

Contextual Notes

Participants are navigating the complexities of integrating square roots, and there is a mention of specific formats for integration that may not apply directly to the current problem. The original poster's uncertainty about hyperbolic functions suggests a gap in familiarity with certain mathematical concepts that could be relevant to the solution.

devanlevin
need to integrate the following equation from 1 to 3

[tex]\int[/tex][tex]\sqrt{4x^{6}+16x^{2}}[/tex]

what i tried to do was call x^2, y for example then what i have is (4Y^3+16Y)^0.5
which i don't know how to integrate.
what else can i do, somehow need to play with the equation.
 
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If you let y=x^2 you have to replace x^2 by y and 2xdx by dy.

So I suggest you rewrite your integrand as

[tex] 2x\sqrt{x^4+4}[/tex]

Then applying the substitution, your integral becomes

[tex] \int_{1}^{9}{\sqrt{y^2+4}}[/tex]

Can you finish from here?
 
no, how do i integrate a sqr root with a squared number inside, the only format i have is for sqrt(ax+b)
 
This is not so straightforward...are you familiar with the area hyperbolic functions (inverses of hyperbolic trigonometric functions)?
 
no, any other ways
 

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