What is the integral of 1/(x^2-10x+9) ?

The integral of 1/(x^2-10x+9) is -1/8 ln|x-1|+1/8 ln|x-9|+C

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integral of 1/(x^2-10x+9)

\int \frac{1}{x ^{2} - 10 x + 9} d x

- \frac{1}{8} ln ∣ x - 1 ∣ + \frac{1}{8} ln ∣ x - 9 ∣ + C

Solution steps

\int \frac{1}{x ^{2} - 10 x + 9} d x

Take the partial fraction of

\frac{1}{x ^{2} - 10 x + 9} : - \frac{1}{8 ( x - 1 )} + \frac{1}{8 ( x - 9 )}

= \int - \frac{1}{8 ( x - 1 )} + \frac{1}{8 ( x - 9 )} 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}{8 ( x - 1 )} d x + \int \frac{1}{8 ( x - 9 )} d x

\int \frac{1}{8 ( x - 1 )} d x = \frac{1}{8} ln ∣ x - 1 ∣

\int \frac{1}{8 ( x - 9 )} d x = \frac{1}{8} ln ∣ x - 9 ∣

= - \frac{1}{8} ln ∣ x - 1 ∣ + \frac{1}{8} ln ∣ x - 9 ∣

Add a constant to the solution

= - \frac{1}{8} ln ∣ x - 1 ∣ + \frac{1}{8} ln ∣ x - 9 ∣ + C

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What is the integral of 1/(x^2-10x+9) ?
The integral of 1/(x^2-10x+9) is -1/8 ln|x-1|+1/8 ln|x-9|+C