Simple Indefinite Integral of \int\frac{4}{-e^{4x-7}} = ln(-e^{4x-7}) = -4x+7+C

In summary, a simple indefinite integral is an integral without limits or boundaries, used to find the original function from its derivative. To solve it, one must find the antiderivative using rules and formulas. It can have multiple solutions, and its purpose is to evaluate the area under a curve. However, there are limitations to using simple indefinite integrals, as they can only be used for continuous functions and some functions may not have a closed-form antiderivative.
  • #1
Procrastinate
158
0
[tex]\int\frac{4}{-e^{4x-7}}[/tex]

[tex]=ln-e^{4x-7}}[/tex]

[tex]=-4x+7+C[/tex]

The answer says it is:

[tex]=\-e^{-4x+7}+C[/tex]
 
Last edited:
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  • #2
The book is right, which is easily verifiable by computing the derivative the given answer.
 
  • #3
D H said:
The book is right.

Is there somewhere I went wrong? I am guessing it has something to do with the ln.
I thought that

[tex]\ln{e}=1[/tex]

Therefore: [tex]ln-e^{4x-7}}=-4x+7+C[/tex]
 
Last edited:
  • #4
Yes, the problem is with the natural logarithm.

Just because [itex]\int \frac 1 x \,dx = \ln x[/itex] does not mean that everything of the form [itex]\int \frac 1{f(x)}\,dx[/itex] integrates to [itex]\ln(f(x))[/itex].
 

Related to Simple Indefinite Integral of \int\frac{4}{-e^{4x-7}} = ln(-e^{4x-7}) = -4x+7+C

1. What is a simple indefinite integral?

A simple indefinite integral is an integral that does not have any limits or boundaries. It is also known as an antiderivative, and it is the inverse operation of differentiation. It is represented by the symbol ∫ and is used to find the original function from its derivative.

2. How is a simple indefinite integral solved?

To solve a simple indefinite integral, you need to find the antiderivative of the given function. This is done by using a set of rules and formulas, such as the power rule, product rule, and chain rule. Once the antiderivative is found, you can add a constant of integration to get the final solution.

3. Can a simple indefinite integral have more than one solution?

Yes, a simple indefinite integral can have more than one solution. This is because the constant of integration can take on any value, and each value will result in a different solution. However, all of these solutions will be equivalent to each other.

4. What is the purpose of a simple indefinite integral?

The purpose of a simple indefinite integral is to find the original function from its derivative. It is also used to evaluate the area under a curve, which has many practical applications in fields such as physics, engineering, and economics.

5. Are there any limitations to using simple indefinite integrals?

Yes, there are limitations to using simple indefinite integrals. They can only be used to find the antiderivative of continuous functions. Additionally, some functions do not have a closed-form antiderivative, making it impossible to solve using simple indefinite integrals.

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