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Integration problem 3, don't know what method to use (tried substitution and parts)

  • Thread starter NCyellow
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1. Homework Statement

Indefinite integral:
e^(4x+(e^4x))


2. Homework Equations

I'm thinking integration by parts, involving UV minus integral of Vdu

3. The Attempt at a Solution
So I saw that this can be split into two: e^(4x) times e^(e^4x)).
The latter is a bit complicated. I searched on google but couldn't find anything useful. Substitution U for 4x or e^4x doesn't seem to work...
 

Dick

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Re: Integration problem 3, don't know what method to use (tried substitution and part

What's the derivative of e^(e^(4x))?
 
Re: Integration problem 3, don't know what method to use (tried substitution and part

umm... I'm gonna take a guess and say e^4 or e^e^4? But how is it done? I am a bit confused on it.
 

Dick

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Re: Integration problem 3, don't know what method to use (tried substitution and part

Use the chain rule. Don't guess.
 
Re: Integration problem 3, don't know what method to use (tried substitution and part

With chain rule, is it 4(e^4)?
 

Dick

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Re: Integration problem 3, don't know what method to use (tried substitution and part

Where did the x go? I think you should review the chain rule before you answer again.
 
Re: Integration problem 3, don't know what method to use (tried substitution and part

well, derivative of e^4x is 4e^4x. So that must be an element of the entire answer.
So it will be (something)(4e^4x). But how do you go about deriving the first run?
 

Dick

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Re: Integration problem 3, don't know what method to use (tried substitution and part

Use parentheses to group things, ok? The derivative of f(g(x)) is f'(g(x))*g'(x). What are f and g?
 

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