What is the integral of (x^2)/((x+1)(x-3)) ?

The integral of (x^2)/((x+1)(x-3)) is x-1/4 ln|x+1|+9/4 ln|x-3|+C

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integral of (x^2)/((x+1)(x-3))

\int \frac{x ^{2}}{( x + 1 ) ( x - 3 )} d x

x - \frac{1}{4} ln ∣ x + 1 ∣ + \frac{9}{4} ln ∣ x - 3 ∣ + C

Solution steps

\int \frac{x ^{2}}{( x + 1 ) ( x - 3 )} d x

Take the partial fraction of

\frac{x ^{2}}{( x + 1 ) ( x - 3 )} : 1 - \frac{1}{4 ( x + 1 )} + \frac{9}{4 ( x - 3 )}

= \int 1 - \frac{1}{4 ( x + 1 )} + \frac{9}{4 ( x - 3 )} 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 1 d x - \int \frac{1}{4 ( x + 1 )} d x + \int \frac{9}{4 ( x - 3 )} d x

\int 1 d x = x

\int \frac{1}{4 ( x + 1 )} d x = \frac{1}{4} ln ∣ x + 1 ∣

\int \frac{9}{4 ( x - 3 )} d x = \frac{9}{4} ln ∣ x - 3 ∣

= x - \frac{1}{4} ln ∣ x + 1 ∣ + \frac{9}{4} ln ∣ x - 3 ∣

Add a constant to the solution

= x - \frac{1}{4} ln ∣ x + 1 ∣ + \frac{9}{4} ln ∣ x - 3 ∣ + C

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What is the integral of (x^2)/((x+1)(x-3)) ?
The integral of (x^2)/((x+1)(x-3)) is x-1/4 ln|x+1|+9/4 ln|x-3|+C