What is the integral of (2x-11)/(x^3+2x^2) ?

The integral of (2x-11)/(x^3+2x^2) is 15/4 ln|x|+(11)/(2x)-15/4 ln|x+2|+C

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integral of (2x-11)/(x^3+2x^2)

\int \frac{2 x - 11}{x ^{3} + 2 x ^{2}} d x

\frac{15}{4} ln ∣ x ∣ + \frac{11}{2 x} - \frac{15}{4} ln ∣ x + 2 ∣ + C

Solution steps

\int \frac{2 x - 11}{x ^{3} + 2 x ^{2}} d x

Take the partial fraction of

\frac{2 x - 11}{x ^{3} + 2 x ^{2}} : \frac{15}{4 x} - \frac{11}{2 x ^{2}} - \frac{15}{4 ( x + 2 )}

= \int \frac{15}{4 x} - \frac{11}{2 x ^{2}} - \frac{15}{4 ( x + 2 )} 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{15}{4 x} d x - \int \frac{11}{2 x ^{2}} d x - \int \frac{15}{4 ( x + 2 )} d x

\int \frac{15}{4 x} d x = \frac{15}{4} ln ∣ x ∣

\int \frac{11}{2 x ^{2}} d x = - \frac{11}{2 x}

\int \frac{15}{4 ( x + 2 )} d x = \frac{15}{4} ln ∣ x + 2 ∣

= \frac{15}{4} ln ∣ x ∣ - (- \frac{11}{2 x}) - \frac{15}{4} ln ∣ x + 2 ∣

Simplify

= \frac{15}{4} ln ∣ x ∣ + \frac{11}{2 x} - \frac{15}{4} ln ∣ x + 2 ∣

Add a constant to the solution

= \frac{15}{4} ln ∣ x ∣ + \frac{11}{2 x} - \frac{15}{4} ln ∣ x + 2 ∣ + C

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What is the integral of (2x-11)/(x^3+2x^2) ?
The integral of (2x-11)/(x^3+2x^2) is 15/4 ln|x|+(11)/(2x)-15/4 ln|x+2|+C