Differential Equation Involving Natural Log.

In summary, a differential equation involving natural log is an equation that relates a variable and its derivative through the use of the natural logarithm function. This function helps to model systems with exponential growth or decay. The key components of such an equation are the variable, its derivative, and the natural log function. These equations are commonly used in real-life applications, including population growth, chemical reactions, and electrical circuits. To solve them, one can use techniques such as separation of variables, integrating factors, and substitution, requiring a solid understanding of calculus and algebra.
  • #1
theRukus
49
0

Homework Statement


Calculate the following:
[itex]\int^{-4}_{-6} (x^-1+5x)dx[/itex]


Homework Equations





The Attempt at a Solution


I've worked this down to
[itex]ln(-4) + 5(-4) - ln(-6) - 5(-6)
=ln(-4)-ln(-6)+10[/itex]
The answer to the left half (the ln parts) of the equation is undefined, and the right is 10..
So... undefined + 10? I'm unsure what to say the definite answer is...

Thank you for any help.
 
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  • #2
The antiderivative is

[tex]\int \frac 1 x\,dx = \ln |x|+C[/tex]

The absolute value signs matter when x < 0.
 

1. What is a differential equation involving natural log?

A differential equation involving natural log is an equation that involves a variable and its derivative, where the variable appears as the argument of a natural logarithm function.

2. How is a natural log involved in a differential equation?

A natural log is involved in a differential equation to describe the relationship between a variable and its rate of change. It helps to model systems that exhibit exponential growth or decay.

3. What are the key components of a differential equation involving natural log?

The key components of a differential equation involving natural log are the variable, its derivative, and the natural log function. These components are used to represent the relationship between the variable and its rate of change.

4. How are differential equations involving natural log used in real life?

Differential equations involving natural log are used in many real-life applications, such as modeling population growth, chemical reactions, and electrical circuits. They are also used in physics and engineering to describe systems that exhibit exponential behavior.

5. What are some techniques for solving differential equations involving natural log?

There are various techniques for solving differential equations involving natural log, such as separation of variables, integrating factors, and using substitution. It is important to have a strong understanding of calculus and algebra to solve these equations effectively.

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