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

The integral of 1/((x+1)^2(x-3)) is -1/16 ln|x+1|+1/(4(x+1))+1/16 ln|x-3|+C

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

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

- \frac{1}{16} ln ∣ x + 1 ∣ + \frac{1}{4 ( x + 1 )} + \frac{1}{16} ln ∣ x - 3 ∣ + C

Solution steps

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

Take the partial fraction of

\frac{1}{( x + 1 ) ^{2} ( x - 3 )} : - \frac{1}{16 ( x + 1 )} - \frac{1}{4 ( x + 1 ) ^{2}} + \frac{1}{16 ( x - 3 )}

= \int - \frac{1}{16 ( x + 1 )} - \frac{1}{4 ( x + 1 ) ^{2}} + \frac{1}{16 ( 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 \frac{1}{16 ( x + 1 )} d x - \int \frac{1}{4 ( x + 1 ) ^{2}} d x + \int \frac{1}{16 ( x - 3 )} d x

\int \frac{1}{16 ( x + 1 )} d x = \frac{1}{16} ln ∣ x + 1 ∣

\int \frac{1}{4 ( x + 1 ) ^{2}} d x = - \frac{1}{4 ( x + 1 )}

\int \frac{1}{16 ( x - 3 )} d x = \frac{1}{16} ln ∣ x - 3 ∣

= - \frac{1}{16} ln ∣ x + 1 ∣ - (- \frac{1}{4 ( x + 1 )}) + \frac{1}{16} ln ∣ x - 3 ∣

Simplify

= - \frac{1}{16} ln ∣ x + 1 ∣ + \frac{1}{4 ( x + 1 )} + \frac{1}{16} ln ∣ x - 3 ∣

Add a constant to the solution

= - \frac{1}{16} ln ∣ x + 1 ∣ + \frac{1}{4 ( x + 1 )} + \frac{1}{16} ln ∣ x - 3 ∣ + C

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What is the integral of 1/((x+1)^2(x-3)) ?
The integral of 1/((x+1)^2(x-3)) is -1/16 ln|x+1|+1/(4(x+1))+1/16 ln|x-3|+C