integral from 0 to a of 9xsqrt(a^2-x^2)

Lösung

\int_{0}^{a} 9 x a^{2} - x^{2} d x

3 (a^{2})^{\frac{3}{2}}

Schritte zur Lösung

\int_{0}^{a} 9 x a^{2} - x^{2} d x

Entferne die Konstante:

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

= 9 \cdot \int_{0}^{a} x a^{2} - x^{2} d x

Wende U-Substitution an

= 9 \cdot \int_{a^{2}}^{0} - \frac{u}{2} d u

Entferne die Konstante:

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

= 9 (- \frac{1}{2} \cdot \int_{a^{2}}^{0} u d u)

Wende die Potenzregel an

= 9 (- \frac{1}{2} [\frac{2}{3} u^{\frac{3}{2}}]_{a^{2}}^{0})

Vereinfache

9 (- \frac{1}{2} [\frac{2}{3} u^{\frac{3}{2}}]_{a^{2}}^{0}) : - \frac{9}{2} [\frac{2}{3} u^{\frac{3}{2}}]_{a^{2}}^{0}

= - \frac{9}{2} [\frac{2}{3} u^{\frac{3}{2}}]_{a^{2}}^{0}

Berechne die Grenzen:

- \frac{2}{3} (a^{2})^{\frac{3}{2}}

= - \frac{9}{2} (- \frac{2}{3} (a^{2})^{\frac{3}{2}})

Vereinfache

= 3 (a^{2})^{\frac{3}{2}}

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