integral of y/(sqrt(y+3))

Lösung

\int \frac{y}{y + 3} d y

2 (\frac{1}{3} (y + 3)^{\frac{3}{2}} - 3 y + 3) + C

Schritte zur Lösung

\int \frac{y}{y + 3} d y

Wende U-Substitution an

= \int 2 (u^{2} - 3) d u

Entferne die Konstante:

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

= 2 \cdot \int u^{2} - 3 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

= 2 (\int u^{2} d u - \int 3 d u)

\int u^{2} d u = \frac{u ^{3}}{3}

\int 3 d u = 3 u

= 2 (\frac{u ^{3}}{3} - 3 u)

Setze in

u = y + 3

ein

= 2 (\frac{( y + 3 ) ^{3}}{3} - 3 y + 3)

Vereinfache

2 (\frac{( y + 3 ) ^{3}}{3} - 3 y + 3) : 2 (\frac{1}{3} (y + 3)^{\frac{3}{2}} - 3 y + 3)

= 2 (\frac{1}{3} (y + 3)^{\frac{3}{2}} - 3 y + 3)

Füge eine Konstante zur Lösung hinzu

= 2 (\frac{1}{3} (y + 3)^{\frac{3}{2}} - 3 y + 3) + C

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