What is the integral of ((x+1))/(x^3+x^2-6x) ?

The integral of ((x+1))/(x^3+x^2-6x) is -1/6 ln|x|+3/10 ln|x-2|-2/15 ln|x+3|+C

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

integral of ((x+1))/(x^3+x^2-6x)

\int \frac{( x + 1 )}{x ^{3} + x ^{2} - 6 x} d x

- \frac{1}{6} ln ∣ x ∣ + \frac{3}{10} ln ∣ x - 2 ∣ - \frac{2}{15} ln ∣ x + 3 ∣ + C

Solution steps

\int \frac{x + 1}{x ^{3} + x ^{2} - 6 x} d x

Take the partial fraction of

\frac{x + 1}{x ^{3} + x ^{2} - 6 x} : - \frac{1}{6 x} + \frac{3}{10 ( x - 2 )} - \frac{2}{15 ( x + 3 )}

= \int - \frac{1}{6 x} + \frac{3}{10 ( x - 2 )} - \frac{2}{15 ( x + 3 )} d x

Apply the Sum Rule:

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

= - \int \frac{1}{6 x} d x + \int \frac{3}{10 ( x - 2 )} d x - \int \frac{2}{15 ( x + 3 )} d x

\int \frac{1}{6 x} d x = \frac{1}{6} ln ∣ x ∣

\int \frac{3}{10 ( x - 2 )} d x = \frac{3}{10} ln ∣ x - 2 ∣

\int \frac{2}{15 ( x + 3 )} d x = \frac{2}{15} ln ∣ x + 3 ∣

= - \frac{1}{6} ln ∣ x ∣ + \frac{3}{10} ln ∣ x - 2 ∣ - \frac{2}{15} ln ∣ x + 3 ∣

Add a constant to the solution

= - \frac{1}{6} ln ∣ x ∣ + \frac{3}{10} ln ∣ x - 2 ∣ - \frac{2}{15} ln ∣ x + 3 ∣ + C

What is the integral of ((x+1))/(x^3+x^2-6x) ?
The integral of ((x+1))/(x^3+x^2-6x) is -1/6 ln|x|+3/10 ln|x-2|-2/15 ln|x+3|+C