Integral of Exponential with Polynomial Argument

In summary, the integral of exponential with polynomial argument is more complex than a regular exponential integral due to the addition of a polynomial argument. It can be solved using substitution, but may require multiple substitutions and can be a lengthy process. There are special cases where the integral can be solved using the regular exponential integral formula or substitution for a linear function. Some real-world applications of this integral include modeling population growth, radioactive decay, and analyzing systems in physics, engineering, and economics.
  • #1
LayMuon
149
1
How can I find an Integral of an exponential with Polynomial argument with finite limits:

[itex]

\int_0^\pi \exp^{-a x^2 -b x^4} dx \\

\int_0^\pi \exp^{-a x^2 -b x^4} (x - x^3)dx

[/itex]
 
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  • #3
Doesn't evaluate the first one.
 
  • #4
There likely is no closed form solution for the top one in terms of a and b. Put in numbers for a and b and there are a lot of tools that will integrate it numerically, including Wolfram Alpha.
 

FAQ: Integral of Exponential with Polynomial Argument

1. What is the formula for finding the integral of exponential with polynomial argument?

The formula for finding the integral of exponential with polynomial argument is:

∫ e^ax^n dx = (e^ax^n)/(a(n+1)) + C

2. How is the integral of exponential with polynomial argument different from a regular exponential integral?

The difference between the integral of exponential with polynomial argument and a regular exponential integral is that the polynomial argument adds an additional variable to the equation. This means that the power of the exponential term is not a constant, but rather a polynomial expression. This makes the integration more complex compared to a regular exponential integral.

3. Can the integral of exponential with polynomial argument be solved using substitution?

Yes, the integral of exponential with polynomial argument can be solved using substitution. However, it may require multiple substitutions and can be a more lengthy process compared to other integration techniques such as integration by parts or partial fractions.

4. Are there any special cases for solving the integral of exponential with polynomial argument?

Yes, there are certain special cases for solving the integral of exponential with polynomial argument. For example, if the polynomial argument is a constant, then the integral can be solved using the regular exponential integral formula. Another special case is when the polynomial argument has a degree of 1, making it a linear function, which can also be solved using substitution.

5. What are some real-world applications of the integral of exponential with polynomial argument?

The integral of exponential with polynomial argument has various real-world applications in fields such as physics, engineering, and economics. For example, it can be used to model the growth of populations, the decay of radioactive substances, and the change in value of investments over time. It is also used in signal processing and control systems to analyze and predict the behavior of systems over time.

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