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Beliebt Rechnen >

integral of (x^2+3x+5)/(x+1)

Lösung

\int \frac{x ^{2} + 3 x + 5}{x + 1} d x

Lösung

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

Schritte zur Lösung

\int \frac{x ^{2} + 3 x + 5}{x + 1} d x

Multipliziere aus

\frac{x ^{2} + 3 x + 5}{x + 1} : \frac{x ^{2}}{x + 1} + \frac{3 x}{x + 1} + \frac{5}{x + 1}

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{x ^{2}}{x + 1} d x + \int \frac{3 x}{x + 1} d x + \int \frac{5}{x + 1} d x

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

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

\int \frac{5}{x + 1} d x = 5 ln ∣ x + 1 ∣

= \frac{( x + 1 ) ^{2}}{2} - 2 (x + 1) + ln ∣ x + 1 ∣ + 3 (x + 1 - ln ∣ x + 1 ∣) + 5 ln ∣ x + 1 ∣

Vereinfache

\frac{( x + 1 ) ^{2}}{2} - 2 (x + 1) + ln ∣ x + 1 ∣ + 3 (x + 1 - ln ∣ x + 1 ∣) + 5 ln ∣ x + 1 ∣ : x + 3 ln ∣ x + 1 ∣ + \frac{1}{2} (x + 1)^{2} + 1

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

Füge eine Konstante zur Lösung hinzu

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

Graph

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