What is the integral of (1/(x*(5-x))) ?

The integral of (1/(x*(5-x))) is 1/5 ln|x|-1/5 ln|x-5|+C

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integral of (1/(x*(5-x)))

\int (\frac{1}{x \cdot ( 5 - x )}) d x

\frac{1}{5} ln ∣ x ∣ - \frac{1}{5} ln ∣ x - 5 ∣ + C

Solution steps

\int \frac{1}{x ( 5 - x )} d x

Take the partial fraction of

\frac{1}{x ( 5 - x )} : \frac{1}{5 x} - \frac{1}{5 ( x - 5 )}

= \int \frac{1}{5 x} - \frac{1}{5 ( x - 5 )} 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

= \int \frac{1}{5 x} d x - \int \frac{1}{5 ( x - 5 )} d x

\int \frac{1}{5 x} d x = \frac{1}{5} ln ∣ x ∣

\int \frac{1}{5 ( x - 5 )} d x = \frac{1}{5} ln ∣ x - 5 ∣

= \frac{1}{5} ln ∣ x ∣ - \frac{1}{5} ln ∣ x - 5 ∣

Add a constant to the solution

= \frac{1}{5} ln ∣ x ∣ - \frac{1}{5} ln ∣ x - 5 ∣ + C

What is the integral of (1/(x*(5-x))) ?
The integral of (1/(x*(5-x))) is 1/5 ln|x|-1/5 ln|x-5|+C