What is the integral of 1/((x+1)(x+4)) ?

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

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integral of 1/((x+1)(x+4))

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

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

Solution steps

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

Take the partial fraction of

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

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

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

\int \frac{1}{3 ( x + 4 )} d x = \frac{1}{3} ln ∣ x + 4 ∣

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

Add a constant to the solution

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

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