What is the integral of (2x-7)/((x+1)(x-3)) ?

The integral of (2x-7)/((x+1)(x-3)) is 9/4 ln|x+1|-1/4 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 (2x-7)/((x+1)(x-3))

\int \frac{2 x - 7}{( x + 1 ) ( x - 3 )} d x

\frac{9}{4} ln ∣ x + 1 ∣ - \frac{1}{4} ln ∣ x - 3 ∣ + C

Solution steps

\int \frac{2 x - 7}{( x + 1 ) ( x - 3 )} d x

Expand

\frac{2 x - 7}{( x + 1 ) ( x - 3 )} : \frac{2 x}{( x + 1 ) ( x - 3 )} - \frac{7}{( x + 1 ) ( x - 3 )}

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{2 x}{( x + 1 ) ( x - 3 )} d x - \int \frac{7}{( x + 1 ) ( x - 3 )} d x

\int \frac{2 x}{( x + 1 ) ( x - 3 )} d x = 2 (\frac{1}{4} ln ∣ x + 1 ∣ + \frac{3}{4} ln ∣ x - 3 ∣)

\int \frac{7}{( x + 1 ) ( x - 3 )} d x = 7 (- \frac{1}{4} ln ∣ x + 1 ∣ + \frac{1}{4} ln ∣ x - 3 ∣)

= 2 (\frac{1}{4} ln ∣ x + 1 ∣ + \frac{3}{4} ln ∣ x - 3 ∣) - 7 (- \frac{1}{4} ln ∣ x + 1 ∣ + \frac{1}{4} ln ∣ x - 3 ∣)

Simplify

2 (\frac{1}{4} ln ∣ x + 1 ∣ + \frac{3}{4} ln ∣ x - 3 ∣) - 7 (- \frac{1}{4} ln ∣ x + 1 ∣ + \frac{1}{4} ln ∣ x - 3 ∣) : \frac{9}{4} ln ∣ x + 1 ∣ - \frac{1}{4} ln ∣ x - 3 ∣

= \frac{9}{4} ln ∣ x + 1 ∣ - \frac{1}{4} ln ∣ x - 3 ∣

Add a constant to the solution

= \frac{9}{4} ln ∣ x + 1 ∣ - \frac{1}{4} ln ∣ x - 3 ∣ + C

What is the integral of (2x-7)/((x+1)(x-3)) ?
The integral of (2x-7)/((x+1)(x-3)) is 9/4 ln|x+1|-1/4 ln|x-3|+C