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Integral of 0.5+x*lg(x) dx

Limits of integration:

from to
v

The graph:

from to

Piecewise:

The solution

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  2                    
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 |  (1/2 + x*log(x)) dx
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$$\int\limits_{1}^{2} \left(x \log{\left(x \right)} + \frac{1}{2}\right)\, dx$$
Integral(1/2 + x*log(x), (x, 1, 2))
Detail solution
  1. Integrate term-by-term:

    1. There are multiple ways to do this integral.

      Method #1

      1. Let .

        Then let and substitute :

        1. Use integration by parts:

          Let and let .

          Then .

          To find :

          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 the exponential function is itself.

              So, the result is:

            Now substitute back in:

          Now evaluate the sub-integral.

        2. 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 the exponential function is itself.

              So, the result is:

            Now substitute back in:

          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 is when :

        Now evaluate the sub-integral.

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

        1. The integral of is when :

        So, the result is:

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

    The result is:

  2. Now simplify:

  3. Add the constant of integration:


The answer is:

The answer (Indefinite) [src]
  /                               2    2       
 |                           x   x    x *log(x)
 | (1/2 + x*log(x)) dx = C + - - -- + ---------
 |                           2   4        2    
/                                              
$$\int \left(x \log{\left(x \right)} + \frac{1}{2}\right)\, dx = C + \frac{x^{2} \log{\left(x \right)}}{2} - \frac{x^{2}}{4} + \frac{x}{2}$$
The graph
The answer [src]
-1/4 + 2*log(2)
$$- \frac{1}{4} + 2 \log{\left(2 \right)}$$
=
=
-1/4 + 2*log(2)
$$- \frac{1}{4} + 2 \log{\left(2 \right)}$$
-1/4 + 2*log(2)
Numerical answer [src]
1.13629436111989
1.13629436111989

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