integral of 1/(xsqrt(4x+25))

Lösung

\int \frac{1}{x 4 x + 25} d x

- \frac{1}{5} (ln \frac{4 x + 25}{5} + 1 - ln \frac{4 x + 25}{5} - 1) + C

Schritte zur Lösung

\int \frac{1}{x 4 x + 25} d x

Wende U-Substitution an

= \int \frac{2}{u ^{2} - 25} d u

Entferne die Konstante:

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

= 2 \cdot \int \frac{1}{u ^{2} - 25} d u

Wende integrale Substitution an

= 2 \cdot \int \frac{1}{5 ( v ^{2} - 1 )} d v

Entferne die Konstante:

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

= 2 \cdot \frac{1}{5} \cdot \int \frac{1}{v ^{2} - 1} d v

Faktorisiere

v^{2} - 1 : - (- v^{2} + 1)

= 2 \cdot \frac{1}{5} \cdot \int \frac{1}{- ( - v ^{2} + 1 )} d v

Entferne die Konstante:

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

= 2 \cdot \frac{1}{5} (- \int \frac{1}{- v ^{2} + 1} d v)

Nutze das gemeinsame Integral :

\int \frac{1}{- v ^{2} + 1} d v = \frac{ln ∣ v + 1 ∣}{2} - \frac{ln ∣ v - 1 ∣}{2}

= 2 \cdot \frac{1}{5} (- (\frac{ln ∣ v + 1 ∣}{2} - \frac{ln ∣ v - 1 ∣}{2}))

Ersetze zurück

= 2 \cdot \frac{1}{5} - \frac{ln \frac{4 x + 25}{5} + 1}{2} - \frac{ln \frac{4 x + 25}{5} - 1}{2}

Vereinfache

2 \cdot \frac{1}{5} - \frac{ln \frac{4 x + 25}{5} + 1}{2} - \frac{ln \frac{4 x + 25}{5} - 1}{2} : - \frac{1}{5} (ln \frac{4 x + 25}{5} + 1 - ln \frac{4 x + 25}{5} - 1)

= - \frac{1}{5} (ln \frac{4 x + 25}{5} + 1 - ln \frac{4 x + 25}{5} - 1)

Füge eine Konstante zur Lösung hinzu

= - \frac{1}{5} (ln \frac{4 x + 25}{5} + 1 - ln \frac{4 x + 25}{5} - 1) + C

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