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Beliebt Rechnen >

integral of (4x^2+2x-1)/(x^3+x^2)

Lösung

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

Lösung

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

Schritte zur Lösung

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

Ermittle den Partialbruch von

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

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

\int \frac{3}{x} d x = 3 ln ∣ x ∣

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

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

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

Vereinfache

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

Füge eine Konstante zur Lösung hinzu

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

Graph

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