What is the integral of 7/(x+\sqrt[3]{x)} ?

The integral of 7/(x+\sqrt[3]{x)} is 21/2 ln|x^{2/3}+1|+C

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integral of 7/(x+\sqrt[3]{x)}

\int \frac{7}{x + 3 x} d x

\frac{21}{2} ln x^{\frac{2}{3}} + 1 + C

Solution steps

\int \frac{7}{x + 3 x} d x

Take the constant out:

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

= 7 \cdot \int \frac{1}{x + 3 x} d x

Apply u-substitution

: \int \frac{3 u}{u ^{2} + 1} d u

= 7 \cdot \int \frac{3 u}{u ^{2} + 1} d u

Take the constant out:

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

= 7 \cdot 3 \cdot \int \frac{u}{u ^{2} + 1} d u

Apply u-substitution

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

= 7 \cdot 3 \cdot \int \frac{1}{2 v} d v

Take the constant out:

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

= 7 \cdot 3 \cdot \frac{1}{2} \cdot \int \frac{1}{v} d v

Use the common integral:

\int \frac{1}{v} d v = ln (∣ v ∣)

= 7 \cdot 3 \cdot \frac{1}{2} ln ∣ v ∣

Substitute back

= 7 \cdot 3 \cdot \frac{1}{2} ln (3 x)^{2} + 1

Simplify

7 \cdot 3 \cdot \frac{1}{2} ln (3 x)^{2} + 1 : \frac{21}{2} ln x^{\frac{2}{3}} + 1

= \frac{21}{2} ln x^{\frac{2}{3}} + 1

Add a constant to the solution

= \frac{21}{2} ln x^{\frac{2}{3}} + 1 + C

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What is the integral of 7/(x+\sqrt[3]{x)} ?
The integral of 7/(x+\sqrt[3]{x)} is 21/2 ln|x^{2/3}+1|+C