integral from 0 to 9 of 2piy(81-y^2)

Lösung

\int_{0}^{9} 2 π y (81 - y^{2}) d y

\frac{6561 π}{2}

Dezimale

10305.99470 \dots

Schritte zur Lösung

\int_{0}^{9} 2 π y (81 - y^{2}) d y

Entferne die Konstante:

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

= 2 π \cdot \int_{0}^{9} y (81 - y^{2}) d y

Multipliziere aus

y (81 - y^{2}) : 81 y - y^{3}

= 2 π \cdot \int_{0}^{9} 81 y - y^{3} d y

Wende die Summenregel an:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 2 π (\int_{0}^{9} 81 y d y - \int_{0}^{9} y^{3} d y)

\int_{0}^{9} 81 y d y = \frac{6561}{2}

\int_{0}^{9} y^{3} d y = \frac{6561}{4}

= 2 π (\frac{6561}{2} - \frac{6561}{4})

Vereinfache

2 π (\frac{6561}{2} - \frac{6561}{4}) : \frac{6561 π}{2}

= \frac{6561 π}{2}