Mister Exam

Integral of ln(2x+1) dx

Limits of integration:

from to
v

The graph:

from to

Piecewise:

The solution

You have entered [src]
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 |  log(2*x + 1) dx
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$$\int\limits_{0}^{1} \log{\left(2 x + 1 \right)}\, dx$$
Integral(log(2*x + 1), (x, 0, 1))
Detail solution
  1. There are multiple ways to do this integral.

    Method #1

    1. Let .

      Then let and substitute :

      1. The integral of a constant times a function is the constant times the integral of the function:

        1. Use integration by parts:

          Let and let .

          Then .

          To find :

          1. The integral of a constant is the constant times the variable of integration:

          Now evaluate the sub-integral.

        2. The integral of a constant is the constant times the variable of integration:

        So, the result is:

      Now substitute back in:

    Method #2

    1. Use integration by parts:

      Let and let .

      Then .

      To find :

      1. The integral of a constant is the constant times the variable of integration:

      Now evaluate the sub-integral.

    2. The integral of a constant times a function is the constant times the integral of the function:

      1. Rewrite the integrand:

      2. Integrate term-by-term:

        1. The integral of a constant is the constant times the variable of integration:

        1. The integral of a constant times a function is the constant times the integral of the function:

          1. Let .

            Then let and substitute :

            1. The integral of a constant times a function is the constant times the integral of the function:

              1. The integral of is .

              So, the result is:

            Now substitute back in:

          So, the result is:

        The result is:

      So, the result is:

  2. Now simplify:

  3. Add the constant of integration:


The answer is:

The answer (Indefinite) [src]
  /                                                      
 |                     1           (2*x + 1)*log(2*x + 1)
 | log(2*x + 1) dx = - - + C - x + ----------------------
 |                     2                     2           
/                                                        
$$\int \log{\left(2 x + 1 \right)}\, dx = C - x + \frac{\left(2 x + 1\right) \log{\left(2 x + 1 \right)}}{2} - \frac{1}{2}$$
The graph
The answer [src]
     3*log(3)
-1 + --------
        2    
$$-1 + \frac{3 \log{\left(3 \right)}}{2}$$
=
=
     3*log(3)
-1 + --------
        2    
$$-1 + \frac{3 \log{\left(3 \right)}}{2}$$
-1 + 3*log(3)/2
Numerical answer [src]
0.647918433002165
0.647918433002165
The graph
Integral of ln(2x+1) dx

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