What is the integral of (9x^8+4)/(x^9+4x) ?

The integral of (9x^8+4)/(x^9+4x) is ln|x^9+4x|+C

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integral of (9x^8+4)/(x^9+4x)

\int \frac{9 x ^{8} + 4}{x ^{9} + 4 x} d x

ln x^{9} + 4 x + C

Solution steps

\int \frac{9 x ^{8} + 4}{x ^{9} + 4 x} d x

Apply u-substitution

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

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= ln ∣ u ∣

Substitute back

u = x^{9} + 4 x

= ln x^{9} + 4 x

Add a constant to the solution

= ln x^{9} + 4 x + C

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What is the integral of (9x^8+4)/(x^9+4x) ?
The integral of (9x^8+4)/(x^9+4x) is ln|x^9+4x|+C