Changing order of integration problem

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The discussion focuses on changing the order of integration in a specific integral problem involving the expression \(\int \frac{a}{(b+y)^{\frac{1}{2}}} \, dy\). The participant successfully identifies the substitution \(u = b + y\) and \(du = dy\), transforming the integral into \(\int a(u)^{-\frac{1}{2}} \, du\). This substitution simplifies the integration process, allowing for easier computation of the integral. The key takeaway is the effective use of substitution to facilitate integration in complex bounds.

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I understand how to obtain the new bounds when you change integration, I'm just having problems actually integrating. How did they rewrite the equation to that of step 2?
 
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The inner integral is a dy integral of this form (because x is constant in the dy integral)

\int \frac a {(b+y)^\frac 1 2}\ dy

Let u = b + y, du = dy so it looks like

\int a(u)^{-\frac 1 2}\ du

and integrate it.
 

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