integral of (4x+1)/(x(x+1)^2)

Lösung

\int \frac{4 x + 1}{x ( x + 1 ) ^{2}} d x

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

Schritte zur Lösung

\int \frac{4 x + 1}{x ( x + 1 ) ^{2}} d x

Ermittle den Partialbruch von

\frac{4 x + 1}{x ( x + 1 ) ^{2}} : \frac{1}{x} - \frac{1}{x + 1} + \frac{3}{( x + 1 ) ^{2}}

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

\int \frac{1}{x} d x = ln ∣ x ∣

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

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

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

Füge eine Konstante zur Lösung hinzu

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

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