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Beliebt Rechnen >

integral of (x+9)/(x(x+2))

Lösung

\int \frac{x + 9}{x ( x + 2 )} d x

Lösung

\frac{9}{2} ln ∣ x ∣ - \frac{7}{2} ln ∣ x + 2 ∣ + C

Schritte zur Lösung

\int \frac{x + 9}{x ( x + 2 )} d x

Multipliziere aus

\frac{x + 9}{x ( x + 2 )} : \frac{x}{x ( x + 2 )} + \frac{9}{x ( x + 2 )}

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{x}{x ( x + 2 )} d x + \int \frac{9}{x ( x + 2 )} d x

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

\int \frac{9}{x ( x + 2 )} d x = 9 (\frac{1}{2} ln ∣ x ∣ - \frac{1}{2} ln ∣ x + 2 ∣)

= ln ∣ x + 2 ∣ + 9 (\frac{1}{2} ln ∣ x ∣ - \frac{1}{2} ln ∣ x + 2 ∣)

Vereinfache

ln ∣ x + 2 ∣ + 9 (\frac{1}{2} ln ∣ x ∣ - \frac{1}{2} ln ∣ x + 2 ∣) : \frac{9}{2} ln ∣ x ∣ - \frac{7}{2} ln ∣ x + 2 ∣

= \frac{9}{2} ln ∣ x ∣ - \frac{7}{2} ln ∣ x + 2 ∣

Füge eine Konstante zur Lösung hinzu

= \frac{9}{2} ln ∣ x ∣ - \frac{7}{2} ln ∣ x + 2 ∣ + C

Graph

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