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Beliebt Rechnen >

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

Lösung

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

Lösung

\frac{1}{4} ln ∣ x - 1 ∣ + \frac{3}{4} ln ∣ x + 1 ∣ + \frac{1}{2 ( x + 1 )} + C

Schritte zur Lösung

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

Ermittle den Partialbruch von

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

= \int \frac{1}{4 ( x - 1 )} + \frac{3}{4 ( x + 1 )} - \frac{1}{2 ( 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}{4 ( x - 1 )} d x + \int \frac{3}{4 ( x + 1 )} d x - \int \frac{1}{2 ( x + 1 ) ^{2}} d x

\int \frac{1}{4 ( x - 1 )} d x = \frac{1}{4} ln ∣ x - 1 ∣

\int \frac{3}{4 ( x + 1 )} d x = \frac{3}{4} ln ∣ x + 1 ∣

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

= \frac{1}{4} ln ∣ x - 1 ∣ + \frac{3}{4} ln ∣ x + 1 ∣ - (- \frac{1}{2 ( x + 1 )})

Vereinfache

= \frac{1}{4} ln ∣ x - 1 ∣ + \frac{3}{4} ln ∣ x + 1 ∣ + \frac{1}{2 ( x + 1 )}

Füge eine Konstante zur Lösung hinzu

= \frac{1}{4} ln ∣ x - 1 ∣ + \frac{3}{4} ln ∣ x + 1 ∣ + \frac{1}{2 ( x + 1 )} + C

Graph

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