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Beliebt Rechnen >

integral of 1/(sqrt(3x^2+4x+5))

Lösung

\int \frac{1}{3 x ^{2} + 4 x + 5} d x

Lösung

3 (\frac{1}{9 x ^{2} + 12 x + 15} x + \frac{2}{3} \frac{1}{9 x ^{2} + 12 x + 15} - \frac{3 x + 2}{3 9 x ^{2} + 12 x + 15} + \frac{1}{3} ln \frac{3}{11} x + \frac{2}{11} + \frac{9 x ^{2} + 12 x + 15}{11}) + C

Schritte zur Lösung

\int \frac{1}{3 x ^{2} + 4 x + 5} d x

Vervollständige das Quadrat

3 x^{2} + 4 x + 5 : 3 (x + \frac{2}{3})^{2} + \frac{11}{3}

= \int \frac{1}{3 ( x + \frac{2}{3} ) ^{2} + \frac{11}{3}} d x

Wende U-Substitution an

= \int \frac{3}{9 u ^{2} + 11} d u

\frac{3}{9 u ^{2} + 11} = 3 \frac{1}{9 u ^{2} + 11}

= \int 3 \frac{1}{9 u ^{2} + 11} d u

Entferne die Konstante:

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

= 3 \cdot \int \frac{1}{9 u ^{2} + 11} d u

Wende die partielle Integration an

= 3 (\frac{1}{9 u ^{2} + 11} u - \int - \frac{9 u ^{2}}{( 9 u ^{2} + 11 ) ^{\frac{3}{2}}} d u)

\int - \frac{9 u ^{2}}{( 9 u ^{2} + 11 ) ^{\frac{3}{2}}} d u = \frac{u}{11 + 9 u ^{2}} - \frac{1}{3} ln \frac{3}{11} u + \frac{1}{11} (11 + 9 u^{2})

= 3 (\frac{1}{9 u ^{2} + 11} u - (\frac{u}{11 + 9 u ^{2}} - \frac{1}{3} ln \frac{3}{11} u + \frac{1}{11} (11 + 9 u^{2})))

Setze in

u = x + \frac{2}{3}

ein

= 3 \frac{1}{9 ( x + \frac{2}{3} ) ^{2} + 11} (x + \frac{2}{3}) - \frac{x + \frac{2}{3}}{11 + 9 ( x + \frac{2}{3} ) ^{2}} - \frac{1}{3} ln \frac{3}{11} (x + \frac{2}{3}) + \frac{1}{11} (11 + 9 (x + \frac{2}{3})^{2})

Vereinfache

3 \frac{1}{9 ( x + \frac{2}{3} ) ^{2} + 11} (x + \frac{2}{3}) - \frac{x + \frac{2}{3}}{11 + 9 ( x + \frac{2}{3} ) ^{2}} - \frac{1}{3} ln \frac{3}{11} (x + \frac{2}{3}) + \frac{1}{11} (11 + 9 (x + \frac{2}{3})^{2}) : 3 (\frac{1}{9 x ^{2} + 12 x + 15} x + \frac{2}{3} \frac{1}{9 x ^{2} + 12 x + 15} - \frac{3 x + 2}{3 9 x ^{2} + 12 x + 15} + \frac{1}{3} ln \frac{3}{11} x + \frac{2}{11} + \frac{9 x ^{2} + 12 x + 15}{11})

= 3 (\frac{1}{9 x ^{2} + 12 x + 15} x + \frac{2}{3} \frac{1}{9 x ^{2} + 12 x + 15} - \frac{3 x + 2}{3 9 x ^{2} + 12 x + 15} + \frac{1}{3} ln \frac{3}{11} x + \frac{2}{11} + \frac{9 x ^{2} + 12 x + 15}{11})

Füge eine Konstante zur Lösung hinzu

= 3 (\frac{1}{9 x ^{2} + 12 x + 15} x + \frac{2}{3} \frac{1}{9 x ^{2} + 12 x + 15} - \frac{3 x + 2}{3 9 x ^{2} + 12 x + 15} + \frac{1}{3} ln \frac{3}{11} x + \frac{2}{11} + \frac{9 x ^{2} + 12 x + 15}{11}) + C

Graph

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