What is the integral of (4x)/(100+x^2) ?

The integral of (4x)/(100+x^2) is 2ln|100+x^2|+C

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integral of (4x)/(100+x^2)

\int \frac{4 x}{100 + x ^{2}} d x

2 ln 100 + x^{2} + C

Solution steps

\int \frac{4 x}{100 + x ^{2}} 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}{100 + x ^{2}} d x

Apply u-substitution

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

= 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 = 100 + x^{2}

= 4 \cdot \frac{1}{2} ln 100 + x^{2}

Simplify

4 \cdot \frac{1}{2} ln 100 + x^{2} : 2 ln 100 + x^{2}

= 2 ln 100 + x^{2}

Add a constant to the solution

= 2 ln 100 + x^{2} + C

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What is the integral of (4x)/(100+x^2) ?
The integral of (4x)/(100+x^2) is 2ln|100+x^2|+C