Integration using u substitution

thegoosegirl42
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Homework Statement


Evaluate the integral of (x+1)5^(x+1)^2

Homework Equations

The Attempt at a Solution


I set my u=(x+1) making du=1dx. This makes it u*5^u^2. I integrated the first u to be ((x+1)^2/2) however I don't know what to do with the 5^u^2
 
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thegoosegirl42 said:

Homework Statement


Evaluate the integral of (x+1)5^(x+1)^2

Homework Equations

The Attempt at a Solution


I set my u=(x+1) making du=1dx. This makes it u*5^u^2. I integrated the first u to be ((x+1)^2/2) however I don't know what to do with the 5^u^2

You don't do integrals in pieces like that. Assuming that what you have is ##\int u 5^{u^2}~du## try another u type substitution ##w = u^2##. You may need to review your integration formulas for ##\int a^x~dx##.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...

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