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

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

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

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

ln x^{3} + 4 + C

Solution steps

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

Apply u-substitution

: \int \frac{1}{3 u} d u

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 3 \cdot \frac{1}{3} ln ∣ u ∣

Substitute back

u = x^{3} + 4

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

Simplify

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

= ln x^{3} + 4

Add a constant to the solution

= ln x^{3} + 4 + C

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