Double Integral Choosing Change of Variable

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SUMMARY

The discussion centers on evaluating the double integral \(\int_0^{1} \int_y^{y+2} \sqrt{(x-y)}dxdy\) using a change of variables. The initial attempt involved substituting \(u = x - y\), but this did not simplify the integral effectively. Participants suggested sketching the bounded region of the integral to identify appropriate transformations for \(u\) and \(v\), which should yield two pairs of equations that are similar but shifted. Utilizing the Jacobian will facilitate the integration process.

PREREQUISITES
  • Understanding of double integrals
  • Familiarity with change of variables in integration
  • Knowledge of Jacobian determinants
  • Ability to sketch and analyze bounded regions in the Cartesian plane
NEXT STEPS
  • Learn about the Jacobian transformation in multiple integrals
  • Study techniques for sketching regions defined by double integrals
  • Explore examples of variable substitution in double integrals
  • Practice solving double integrals with different change of variables
USEFUL FOR

Students and educators in calculus, particularly those focusing on multivariable calculus and integration techniques. This discussion is beneficial for anyone looking to enhance their skills in evaluating double integrals through variable substitution.

FallingMan
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Homework Statement


Evaluate the following integral with a change of variable of your choice.

\int_0^{1} \int_y^{y+2} \sqrt{(x-y)}dxdy


The Attempt at a Solution



I'm supposed to choose a u and v that will simplify the integral, but I have no idea how to even start this.

I tried substituting u = x-y, but that doesn't even look like it would make my life simpler. If I did that, I'm not sure what I would choose for v.

Any tips to push me in the right direction would be appreciated.
 
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Have you tried to sketch the region that the integral is bounded over. If you do that you should be able to write four equations for the boundary lines, there should be two pairs that look the same (just shifted) and those two pairs will be your u and v. After that just use the jacobian and it becomes a simple integration problem.
 

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