Integral of 1/(3x-1) dx

The solution

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 oo           
  /           
 |            
 |     1      
 |  ------- dx
 |  3*x - 1   
 |            
/             
2

$$\int\limits_{2}^{\infty} \frac{1}{3 x - 1}\, dx$$

Integral(1/(3*x - 1), (x, 2, oo))

Detail solution

Let $u = 3 x - 1$ .

Then let $du = 3 dx$ and substitute $\frac{du}{3}$ :

$\int \frac{1}{3 u}\, du$
1. The integral of a constant times a function is the constant times the integral of the function:
  
  $\int \frac{1}{u}\, du = \frac{\int \frac{1}{u}\, du}{3}$
  1. The integral of $\frac{1}{u}$ is $\log{\left(u \right)}$ .
  So, the result is: $\frac{\log{\left(u \right)}}{3}$
Now substitute $u$ back in:

$\frac{\log{\left(3 x - 1 \right)}}{3}$
Now simplify:

$\frac{\log{\left(3 x - 1 \right)}}{3}$
Add the constant of integration:

$\frac{\log{\left(3 x - 1 \right)}}{3}+ \mathrm{constant}$

The answer is:

$\frac{\log{\left(3 x - 1 \right)}}{3}+ \mathrm{constant}$

The answer (Indefinite) [src]

  /                             
 |                              
 |    1             log(3*x - 1)
 | ------- dx = C + ------------
 | 3*x - 1               3      
 |                              
/

$$\int \frac{1}{3 x - 1}\, dx = C + \frac{\log{\left(3 x - 1 \right)}}{3}$$

Simplify

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The answer [src]

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$$\infty$$

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$$\infty$$

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Use the examples entering the upper and lower limits of integration.

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Integral of 1/(3x-1) dx

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