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

Lösung

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

\frac{2}{3} ln ∣ x + 1 ∣ + \frac{7}{3} ln ∣ x - 2 ∣ + C

Schritte zur Lösung

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

Ermittle den Partialbruch von

\frac{3 x + 1}{x ^{2} - x - 2} : \frac{2}{3 ( x + 1 )} + \frac{7}{3 ( x - 2 )}

= \int \frac{2}{3 ( x + 1 )} + \frac{7}{3 ( x - 2 )} d x

Wende die Summenregel an:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int \frac{2}{3 ( x + 1 )} d x + \int \frac{7}{3 ( x - 2 )} d x

\int \frac{2}{3 ( x + 1 )} d x = \frac{2}{3} ln ∣ x + 1 ∣

\int \frac{7}{3 ( x - 2 )} d x = \frac{7}{3} ln ∣ x - 2 ∣

= \frac{2}{3} ln ∣ x + 1 ∣ + \frac{7}{3} ln ∣ x - 2 ∣

Füge eine Konstante zur Lösung hinzu

= \frac{2}{3} ln ∣ x + 1 ∣ + \frac{7}{3} ln ∣ x - 2 ∣ + C

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