What is the integral of x/(x-11) ?

The integral of x/(x-11) is x-11+11ln|x-11|+C

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integral of x/(x-11)

\int \frac{x}{x - 11} d x

x - 11 + 11 ln ∣ x - 11 ∣ + C

Solution steps

\int \frac{x}{x - 11} d x

Apply u-substitution

: \int \frac{u + 11}{u} d u

= \int \frac{u + 11}{u} d u

Expand

\frac{u + 11}{u} : 1 + \frac{11}{u}

= \int 1 + \frac{11}{u} d u

Apply the Sum Rule:

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

= \int 1 d u + \int \frac{11}{u} d u

\int 1 d u = u

\int \frac{11}{u} d u = 11 ln ∣ u ∣

= u + 11 ln ∣ u ∣

Substitute back

u = x - 11

= x - 11 + 11 ln ∣ x - 11 ∣

Add a constant to the solution

= x - 11 + 11 ln ∣ x - 11 ∣ + C

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What is the integral of x/(x-11) ?
The integral of x/(x-11) is x-11+11ln|x-11|+C