integral of (x+7)/(x(x+2)^2)

Lösung

\int \frac{x + 7}{x ( x + 2 ) ^{2}} d x

\frac{7}{4} ln ∣ x ∣ - \frac{7}{4} ln ∣ x + 2 ∣ + \frac{5}{2 ( x + 2 )} + C

Schritte zur Lösung

\int \frac{x + 7}{x ( x + 2 ) ^{2}} d x

Ermittle den Partialbruch von

\frac{x + 7}{x ( x + 2 ) ^{2}} : \frac{7}{4 x} - \frac{7}{4 ( x + 2 )} - \frac{5}{2 ( x + 2 ) ^{2}}

= \int \frac{7}{4 x} - \frac{7}{4 ( x + 2 )} - \frac{5}{2 ( x + 2 ) ^{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{7}{4 x} d x - \int \frac{7}{4 ( x + 2 )} d x - \int \frac{5}{2 ( x + 2 ) ^{2}} d x

\int \frac{7}{4 x} d x = \frac{7}{4} ln ∣ x ∣

\int \frac{7}{4 ( x + 2 )} d x = \frac{7}{4} ln ∣ x + 2 ∣

\int \frac{5}{2 ( x + 2 ) ^{2}} d x = - \frac{5}{2 ( x + 2 )}

= \frac{7}{4} ln ∣ x ∣ - \frac{7}{4} ln ∣ x + 2 ∣ - (- \frac{5}{2 ( x + 2 )})

Vereinfache

= \frac{7}{4} ln ∣ x ∣ - \frac{7}{4} ln ∣ x + 2 ∣ + \frac{5}{2 ( x + 2 )}

Füge eine Konstante zur Lösung hinzu

= \frac{7}{4} ln ∣ x ∣ - \frac{7}{4} ln ∣ x + 2 ∣ + \frac{5}{2 ( x + 2 )} + C

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