integral from-1 to 0 of 1/(x^2-25)

Lösung

\int_{- 1}^{0} \frac{1}{x ^{2} - 25} d x

\frac{ln ( \frac{2}{3} )}{10}

Dezimale

- 0.04054 \dots

Schritte zur Lösung

\int_{- 1}^{0} \frac{1}{x ^{2} - 25} d x

Wende integrale Substitution an

= \int_{- \frac{1}{5}}^{0} \frac{1}{5 ( u ^{2} - 1 )} d u

Entferne die Konstante:

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

= \frac{1}{5} \cdot \int_{- \frac{1}{5}}^{0} \frac{1}{u ^{2} - 1} d u

Faktorisiere

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

= \frac{1}{5} \cdot \int_{- \frac{1}{5}}^{0} \frac{1}{- ( - u ^{2} + 1 )} d u

Entferne die Konstante:

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

= \frac{1}{5} (- \int_{- \frac{1}{5}}^{0} \frac{1}{- u ^{2} + 1} d u)

Nutze das gemeinsame Integral :

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

= \frac{1}{5} (- [\frac{ln ∣ u + 1 ∣}{2} - \frac{ln ∣ u - 1 ∣}{2}]_{- \frac{1}{5}}^{0})

Vereinfache

\frac{1}{5} (- [\frac{ln ∣ u + 1 ∣}{2} - \frac{ln ∣ u - 1 ∣}{2}]_{- \frac{1}{5}}^{0}) : - \frac{1}{5} [\frac{ln ∣ u + 1 ∣ - ln ∣ u - 1 ∣}{2}]_{- \frac{1}{5}}^{0}

= - \frac{1}{5} [\frac{ln ∣ u + 1 ∣ - ln ∣ u - 1 ∣}{2}]_{- \frac{1}{5}}^{0}

Berechne die Grenzen:

- \frac{ln ( \frac{4}{5} ) - ln ( \frac{6}{5} )}{2}

= - \frac{1}{5} (- \frac{ln ( \frac{4}{5} ) - ln ( \frac{6}{5} )}{2})

Vereinfache

= \frac{ln ( \frac{2}{3} )}{10}

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