What is the integral of (324)/(x^3-18x^2) ?

The integral of (324)/(x^3-18x^2) is -ln|x|+(18)/x+ln|x-18|+C

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integral of (324)/(x^3-18x^2)

\int \frac{324}{x ^{3} - 18 x ^{2}} d x

- ln ∣ x ∣ + \frac{18}{x} + ln ∣ x - 18 ∣ + C

Solution steps

\int \frac{324}{x ^{3} - 18 x ^{2}} d x

Take the constant out:

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

= 324 \cdot \int \frac{1}{x ^{3} - 18 x ^{2}} d x

Take the partial fraction of

\frac{1}{x ^{3} - 18 x ^{2}} : - \frac{1}{324 x} - \frac{1}{18 x ^{2}} + \frac{1}{324 ( x - 18 )}

= 324 \cdot \int - \frac{1}{324 x} - \frac{1}{18 x ^{2}} + \frac{1}{324 ( x - 18 )} d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 324 (- \int \frac{1}{324 x} d x - \int \frac{1}{18 x ^{2}} d x + \int \frac{1}{324 ( x - 18 )} d x)

\int \frac{1}{324 x} d x = \frac{1}{324} ln ∣ x ∣

\int \frac{1}{18 x ^{2}} d x = - \frac{1}{18 x}

\int \frac{1}{324 ( x - 18 )} d x = \frac{1}{324} ln ∣ x - 18 ∣

= 324 (- \frac{1}{324} ln ∣ x ∣ - (- \frac{1}{18 x}) + \frac{1}{324} ln ∣ x - 18 ∣)

Simplify

324 (- \frac{1}{324} ln ∣ x ∣ - (- \frac{1}{18 x}) + \frac{1}{324} ln ∣ x - 18 ∣) : - ln ∣ x ∣ + \frac{18}{x} + ln ∣ x - 18 ∣

= - ln ∣ x ∣ + \frac{18}{x} + ln ∣ x - 18 ∣

Add a constant to the solution

= - ln ∣ x ∣ + \frac{18}{x} + ln ∣ x - 18 ∣ + C

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What is the integral of (324)/(x^3-18x^2) ?
The integral of (324)/(x^3-18x^2) is -ln|x|+(18)/x+ln|x-18|+C