integral from 1 to 2 of xsqrt(2-x)

Lösung

\int_{1}^{2} x 2 - x d x

\frac{14}{15}

Dezimale

0.93333 \dots

Schritte zur Lösung

\int_{1}^{2} x 2 - x d x

Wende U-Substitution an

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

\int_{a}^{b} f (x) d x = - \int_{b}^{a} f (x) d x, a < b

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

Entferne die Konstante:

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

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

Multipliziere aus

(- u + 2) u : - u^{\frac{3}{2}} + 2 u

= - (- \int_{0}^{1} - u^{\frac{3}{2}} + 2 u 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_{0}^{1} u^{\frac{3}{2}} d u + \int_{0}^{1} 2 u d u))

\int_{0}^{1} u^{\frac{3}{2}} d u = \frac{2}{5}

\int_{0}^{1} 2 u d u = \frac{4}{3}

= - (- (- \frac{2}{5} + \frac{4}{3}))

Vereinfache

- (- (- \frac{2}{5} + \frac{4}{3})) : \frac{14}{15}

= \frac{14}{15}

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