Solving Integral: x + 4a + b / [x - (a + b)]^2 + c^2

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In summary, the conversation is about solving a specific integral using substitutions and without the use of integral tables. The participants discuss how to rewrite the integral and suggest possible substitutions to simplify the problem. They also mention that the final result will involve ln and arctan.
  • #1
sccv
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I have to solve this integral

[tex]\int{\frac{x + 4a + b}{[x - (a + b)]^2 + c^2}}dx[/tex]

where a, b, c are constant

Could anybody know how to solve it ?
 
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  • #2
You can rewrite the integral as:

[tex]\int{\frac{x - (a + b)}{[x - (a + b)]^2 + c^2}}dx + \int{\frac{5a+2b}{[x - (a + b)]^2 + c^2}}dx[/tex]

Can you solve it now looking at the two integrals separately? Do you have integral tables to work with?
 
  • #3
learningphysics said:
You can rewrite the integral as:

[tex]\int{\frac{x - (a + b)}{[x - (a + b)]^2 + c^2}}dx + \int{\frac{5a+2b}{[x - (a + b)]^2 + c^2}}dx[/tex]

Can you solve it now looking at the two integrals separately? Do you have integral tables to work with?

He doesn't need tables so solve this kind of integrals.Just well made substitutions.
Your integral should be put in the form:
[tex]\frac{1}{2}\int\frac{d[[x - (a + b)]^2+c^2]}{[x - (a + b)]^2 + c^2}+ (5a+2b)\int \frac{d[x-(a+b)]}{[x - (a + b)]^2 + c^2}[/tex]

Do u see some patterns for substitutions which should bring the 2 integrals to familiar form??ln & artan in the final result??

Daniel.
 
  • #4
Thank you!
I also came to get those result.
 

FAQ: Solving Integral: x + 4a + b / [x - (a + b)]^2 + c^2

What is an integral?

An integral is a mathematical concept that represents the area under a curve on a graph. It is used to solve problems in calculus, such as finding the area of a shape or the volume of a solid.

How do you solve integrals?

To solve an integral, you must first identify the function and the limits of integration. Then, you can use various techniques such as substitution, integration by parts, or trigonometric substitution to simplify the integral. Finally, you can use the fundamental theorem of calculus to evaluate the integral and find the solution.

What is the purpose of solving integrals?

Solving integrals is important in many fields of science and engineering, as it allows us to calculate quantities such as areas, volumes, and rates of change. It is also used to model and analyze real-world problems, making it a crucial tool in problem-solving and decision-making.

How is the integral in the given equation solved?

The integral in the given equation can be solved using a combination of substitution and integration by parts. First, we can substitute u = x - (a + b) to simplify the integral. Then, we can use integration by parts with u = x + 4a + b and dv = du to further simplify the integral. Finally, we can use the fundamental theorem of calculus to evaluate the integral and find the solution.

Can integrals be solved without using calculus?

No, integrals cannot be solved without using calculus. The concept of integration is a fundamental part of calculus, and it is necessary to understand and apply it in order to solve integrals. However, there are some simple integrals that can be solved using basic algebraic techniques without using calculus.

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