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Beliebt Rechnen >

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

Lösung

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

Lösung

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

Schritte zur Lösung

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

\frac{1}{2 x ^{3} + 2 x ^{2}} = \frac{1}{2} \frac{1}{x ^{3} + x ^{2}}

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

Entferne die Konstante:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

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

Ermittle den Partialbruch von

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

= \frac{1}{2} \cdot \int - \frac{1}{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

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

\int \frac{1}{x} d x = ln ∣ x ∣

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

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

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

Füge eine Konstante zur Lösung hinzu

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

Graph

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