integral from 1 to 3 of (x^2+3)/(4x-x^2)

Lösung

\int_{1}^{3} \frac{x ^{2} + 3}{4 x - x ^{2}} d x

- 2 + \frac{11}{2} ln (3)

Dezimale

4.04236 \dots

Schritte zur Lösung

\int_{1}^{3} \frac{x ^{2} + 3}{4 x - x ^{2}} d x

Faktorisiere

\frac{x ^{2} + 3}{4 x - x ^{2}}

= \int_{1}^{3} \frac{x ^{2} + 3}{- x ( x - 4 )} d x

Entferne die Konstante:

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

= - \int_{1}^{3} \frac{x ^{2} + 3}{x ( x - 4 )} d x

Multipliziere aus

\frac{x ^{2} + 3}{x ( x - 4 )} : \frac{x ^{2}}{x ( x - 4 )} + \frac{3}{x ( x - 4 )}

Wende die Summenregel an:

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

= - (\int_{1}^{3} \frac{x ^{2}}{x ( x - 4 )} d x + \int_{1}^{3} \frac{3}{x ( x - 4 )} d x)

\int_{1}^{3} \frac{x ^{2}}{x ( x - 4 )} d x = 2 - 4 ln (3)

\int_{1}^{3} \frac{3}{x ( x - 4 )} d x = - \frac{3}{2} ln (3)

= - (2 - 4 ln (3) - \frac{3}{2} ln (3))

Vereinfache

- (2 - 4 ln (3) - \frac{3}{2} ln (3)) : - 2 + \frac{11}{2} ln (3)

= - 2 + \frac{11}{2} ln (3)