What is the integral of (2x)/(x+2) ?

The integral of (2x)/(x+2) is 2(x+2-2ln|x+2|)+C

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

integral of (2x)/(x+2)

integral

\frac{2 x}{x + 2}

2 (x + 2 - 2 ln ∣ x + 2 ∣) + C

Solution steps

\int \frac{2 x}{x + 2} d x

Take the constant out:

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

= 2 \cdot \int \frac{x}{x + 2} d x

Apply u-substitution

= 2 \cdot \int \frac{u - 2}{u} d u

Expand

\frac{u - 2}{u} : 1 - \frac{2}{u}

= 2 \cdot \int 1 - \frac{2}{u} d u

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

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

\int 1 d u = u

\int \frac{2}{u} d u = 2 ln ∣ u ∣

= 2 (u - 2 ln ∣ u ∣)

Substitute back

u = x + 2

= 2 (x + 2 - 2 ln ∣ x + 2 ∣)

Add a constant to the solution

= 2 (x + 2 - 2 ln ∣ x + 2 ∣) + C

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