integral of x(x-21)^2

Lösung

\int x (x - 21)^{2} d x

\frac{x ^{4}}{4} - 14 x^{3} + \frac{441 x ^{2}}{2} + C

Schritte zur Lösung

\int x (x - 21)^{2} d x

Multipliziere aus

x (x - 21)^{2} : x^{3} - 42 x^{2} + 441 x

= \int x^{3} - 42 x^{2} + 441 x d x

Wende die Summenregel an:

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

= \int x^{3} d x - \int 42 x^{2} d x + \int 441 x d x

\int x^{3} d x = \frac{x ^{4}}{4}

\int 42 x^{2} d x = 14 x^{3}

\int 441 x d x = \frac{441 x ^{2}}{2}

= \frac{x ^{4}}{4} - 14 x^{3} + \frac{441 x ^{2}}{2}

Füge eine Konstante zur Lösung hinzu

= \frac{x ^{4}}{4} - 14 x^{3} + \frac{441 x ^{2}}{2} + C

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