What is the integral of (4x)/(x^2+3) ?

The integral of (4x)/(x^2+3) is 2ln|x^2+3|+C

integral of (4x)/(x^2+3)

\int \frac{4 x}{x ^{2} + 3} d x

2 ln x^{2} + 3 + C

Solution steps

\int \frac{4 x}{x ^{2} + 3} d x

Take the constant out:

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

= 4 \cdot \int \frac{x}{x ^{2} + 3} d x

Apply u-substitution

= 4 \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

= 4 \cdot \frac{1}{2} \cdot \int \frac{1}{u} d u

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 4 \cdot \frac{1}{2} ln ∣ u ∣

Substitute back

u = x^{2} + 3

= 4 \cdot \frac{1}{2} ln x^{2} + 3

Simplify

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

= 2 ln x^{2} + 3

Add a constant to the solution

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

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What is the integral of (4x)/(x^2+3) ?
The integral of (4x)/(x^2+3) is 2ln|x^2+3|+C