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

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

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

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

ln x^{2} + k + C

Solution steps

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

Apply u-substitution

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

= 2 \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

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 2 \cdot \frac{1}{2} ln ∣ u ∣

Substitute back

u = x^{2} + k

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

Simplify

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

= ln x^{2} + k

Add a constant to the solution

= ln x^{2} + k + C

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