integral of (2x^2)/(x+6)

Lösung

\int \frac{2 x ^{2}}{x + 6} d x

x^{2} - 12 x + 72 ln ∣ x + 6 ∣ - 108 + C

Schritte zur Lösung

\int \frac{2 x ^{2}}{x + 6} d x

Entferne die Konstante:

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

= 2 \cdot \int \frac{x ^{2}}{x + 6} d x

Wende U-Substitution an

= 2 \cdot \int \frac{( u - 6 ) ^{2}}{u} d u

Multipliziere aus

\frac{( u - 6 ) ^{2}}{u} : u - 12 + \frac{36}{u}

= 2 \cdot \int u - 12 + \frac{36}{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

= 2 (\int u d u - \int 12 d u + \int \frac{36}{u} d u)

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

\int 12 d u = 12 u

\int \frac{36}{u} d u = 36 ln ∣ u ∣

= 2 (\frac{u ^{2}}{2} - 12 u + 36 ln ∣ u ∣)

Setze in

u = x + 6

ein

= 2 (\frac{( x + 6 ) ^{2}}{2} - 12 (x + 6) + 36 ln ∣ x + 6 ∣)

Vereinfache

2 (\frac{( x + 6 ) ^{2}}{2} - 12 (x + 6) + 36 ln ∣ x + 6 ∣) : x^{2} - 12 x + 72 ln ∣ x + 6 ∣ - 108

= x^{2} - 12 x + 72 ln ∣ x + 6 ∣ - 108

Füge eine Konstante zur Lösung hinzu

= x^{2} - 12 x + 72 ln ∣ x + 6 ∣ - 108 + C

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