What is the integral of-3ln(2x+1) ?

The integral of-3ln(2x+1) is -3xln(2x+1)-3/2 ln(2x+1)+3x+3/2+C

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integral of-3ln(2x+1)

\int - 3 ln (2 x + 1) d x

- 3 x ln (2 x + 1) - \frac{3}{2} ln (2 x + 1) + 3 x + \frac{3}{2} + C

Solution steps

\int - 3 ln (2 x + 1) d x

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= - 3 \cdot \int ln (2 x + 1) d x

Apply u-substitution

= - 3 \cdot \int ln (u) \frac{1}{2} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= - 3 \cdot \frac{1}{2} \cdot \int ln (u) d u

Apply Integration By Parts

= - 3 \cdot \frac{1}{2} (u ln (u) - \int 1 d u)

\int 1 d u = u

= - 3 \cdot \frac{1}{2} (u ln (u) - u)

Substitute back

u = 2 x + 1

= - 3 \cdot \frac{1}{2} ((2 x + 1) ln (2 x + 1) - (2 x + 1))

Simplify

- 3 \cdot \frac{1}{2} ((2 x + 1) ln (2 x + 1) - (2 x + 1)) : - 3 x ln (2 x + 1) - \frac{3}{2} ln (2 x + 1) + 3 x + \frac{3}{2}

= - 3 x ln (2 x + 1) - \frac{3}{2} ln (2 x + 1) + 3 x + \frac{3}{2}

Add a constant to the solution

= - 3 x ln (2 x + 1) - \frac{3}{2} ln (2 x + 1) + 3 x + \frac{3}{2} + C

What is the integral of-3ln(2x+1) ?
The integral of-3ln(2x+1) is -3xln(2x+1)-3/2 ln(2x+1)+3x+3/2+C