Is There a General Formula for this Partial Fraction Function?

In summary, the conversation is about finding the partial fraction of a function with multiple terms in the denominator. The speaker asks about a general formula for this, and the expert summarizes that usually there is one variable and many constants involved and the c's will be determined by the x's. The speaker confirms that their understanding is correct and thanks the expert for their help.
  • #1
EngWiPy
1,368
61
Hello,

Is there any general formula for the partial fraction of the following function:

[tex]\frac{1}{(ax_1+1)(ax_2+1)\cdots (ax_L+1)}[/tex]

I can work for L=3, but it get involved for larger L!

Thanks in advance
 
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  • #2
Ok... from what I've understood, you want write

[tex]\frac{1}{(ax_1+1)(ax_2+1)\cdots(ax_L+1)}[/tex]

as

[tex]\frac{c_1}{ax_1+1}+\frac{c_2}{ax_2+1}+\cdots+\frac{c_L}{ax_L+1}[/tex]

where the c's are constants. My question is, what is the variable the c's must be independent of? a or x?
 
  • #3
coelho said:
Ok... from what I've understood, you want write

[tex]\frac{1}{(ax_1+1)(ax_2+1)\cdots(ax_L+1)}[/tex]

as

[tex]\frac{c_1}{ax_1+1}+\frac{c_2}{ax_2+1}+\cdots+\frac{c_L}{ax_L+1}[/tex]

where the c's are constants. My question is, what is the variable the c's must be independent of? a or x?

a is a constant, and x's are the variables.
 
  • #4
coelho said:
Ok... from what I've understood, you want write

[tex]\frac{1}{(ax_1+1)(ax_2+1)\cdots(ax_L+1)}[/tex]

as

[tex]\frac{c_1}{ax_1+1}+\frac{c_2}{ax_2+1}+\cdots+\frac{c_L}{ax_L+1}[/tex]

where the c's are constants. My question is, what is the variable the c's must be independent of? a or x?

Problems involving partial fractions usually have one variable and many constants. From the appearance of your expression, I assume a is the variable and the x's are constants. In that case the c's will be determined by the x's.
 
  • #5
mathman said:
Problems involving partial fractions usually have one variable and many constants. From the appearance of your expression, I assume a is the variable and the x's are constants. In that case the c's will be determined by the x's.

yes, right. a is the variable and x's are the constants. I got the general solution expression.

Thanks
 

Related to Is There a General Formula for this Partial Fraction Function?

1. What is a partial fraction?

A partial fraction is a mathematical expression that represents a rational function as a sum of simpler fractions. It is used to simplify integration and solve algebraic equations.

2. How do you decompose a rational function into partial fractions?

To decompose a rational function into partial fractions, you need to first factor the denominator into linear and irreducible quadratic factors. Then, you set up a system of equations using the coefficients of the partial fractions and solve for each unknown coefficient.

3. What is the purpose of using partial fractions?

The purpose of using partial fractions is to simplify complex rational functions into smaller, easier to manage fractions. This allows for easier integration and solving of equations.

4. Can all rational functions be decomposed into partial fractions?

Yes, all rational functions can be decomposed into partial fractions. However, some may result in fractions with complex coefficients.

5. How are partial fractions used in real-world applications?

Partial fractions are used in many areas of science and engineering, including signal processing, control systems, and fluid dynamics. They are also commonly used in solving differential equations and calculating areas under curves in calculus.

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