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

The integral of (3x)/(x^2+3) is 3/2 ln|x^2+3|+C

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

integral of (3x)/(x^2+3)

\int \frac{3 x}{x ^{2} + 3} d x

\frac{3}{2} ln x^{2} + 3 + C

Solution steps

\int \frac{3 x}{x ^{2} + 3} d x

Take the constant out:

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

= 3 \cdot \int \frac{x}{x ^{2} + 3} d x

Apply u-substitution

: \int \frac{1}{2 u} d u

= 3 \cdot \int \frac{1}{2 u} 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 \frac{1}{u} d u

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 3 \cdot \frac{1}{2} ln ∣ u ∣

Substitute back

u = x^{2} + 3

= 3 \cdot \frac{1}{2} ln x^{2} + 3

Simplify

3 \cdot \frac{1}{2} ln x^{2} + 3 : \frac{3}{2} ln x^{2} + 3

= \frac{3}{2} ln x^{2} + 3

Add a constant to the solution

= \frac{3}{2} ln x^{2} + 3 + C

\int \frac{1}{e ^{x + e^{- x}}} d x

\int \frac{sinh ( x )}{cosh ^{2} ( x )} d x

\int (3 e^{x} - sin (x)) d x

\int - 3 x^{2} e^{x^{3}} d x

\int sec^{5} (x) tan^{7} (x) d x

What is the integral of (3x)/(x^2+3) ?
The integral of (3x)/(x^2+3) is 3/2 ln|x^2+3|+C