integral of (3x+5)/(x^2+4)

Lösung

\int \frac{3 x + 5}{x ^{2} + 4} d x

\frac{3}{2} ln x^{2} + 4 + \frac{5}{2} arctan (\frac{x}{2}) + C

Schritte zur Lösung

\int \frac{3 x + 5}{x ^{2} + 4} d x

Multipliziere aus

\frac{3 x + 5}{x ^{2} + 4} : \frac{3 x}{x ^{2} + 4} + \frac{5}{x ^{2} + 4}

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}{x ^{2} + 4} d x + \int \frac{5}{x ^{2} + 4} d x

\int \frac{3 x}{x ^{2} + 4} d x = \frac{3}{2} ln x^{2} + 4

\int \frac{5}{x ^{2} + 4} d x = \frac{5}{2} arctan (\frac{x}{2})

= \frac{3}{2} ln x^{2} + 4 + \frac{5}{2} arctan (\frac{x}{2})

Füge eine Konstante zur Lösung hinzu

= \frac{3}{2} ln x^{2} + 4 + \frac{5}{2} arctan (\frac{x}{2}) + C

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