integral from 0 to 4 of xsqrt(4x-x^2)

Lösung

\int_{0}^{4} x 4 x - x^{2} d x

4 π

Dezimale

12.56637 \dots

Schritte zur Lösung

\int_{0}^{4} x 4 x - x^{2} d x

Vervollständige das Quadrat

4 x - x^{2} : - (x - 2)^{2} + 4

= \int_{0}^{4} x - (x - 2)^{2} + 4 d x

Wende U-Substitution an

= \int_{- 2}^{2} (u + 2) - u^{2} + 4 d u

Multipliziere aus

(u + 2) - u^{2} + 4 : u - u^{2} + 4 + 2 - u^{2} + 4

= \int_{- 2}^{2} u - u^{2} + 4 + 2 - u^{2} + 4 d u

Wende die Summenregel an:

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

= \int_{- 2}^{2} u - u^{2} + 4 d u + \int_{- 2}^{2} 2 - u^{2} + 4 d u

\int_{- 2}^{2} u - u^{2} + 4 d u = 0

\int_{- 2}^{2} 2 - u^{2} + 4 d u = 4 π

= 0 + 4 π

Vereinfache

= 4 π

\int_{- π}^{0} \frac{1}{π}

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