integral of (x+4)/(x^2+5x-6)

Lösung

\int \frac{x + 4}{x ^{2} + 5 x - 6} d x

ln ∣ x + 6 ∣ + 5 (\frac{1}{7} ln ∣ x - 1 ∣ - \frac{1}{7} ln ∣ x + 6 ∣) + C

Schritte zur Lösung

\int \frac{x + 4}{x ^{2} + 5 x - 6} d x

Faktorisiere

x^{2} + 5 x - 6 : (x - 1) (x + 6)

= \int \frac{x + 4}{( x - 1 ) ( x + 6 )} d x

Wende U-Substitution an

= \int \frac{u + 5}{u ( u + 7 )} d u

Multipliziere aus

\frac{u + 5}{u ( u + 7 )} : \frac{u}{u ( u + 7 )} + \frac{5}{u ( u + 7 )}

Wende die Summenregel an:

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

= \int \frac{u}{u ( u + 7 )} d u + \int \frac{5}{u ( u + 7 )} d u

\int \frac{u}{u ( u + 7 )} d u = ln ∣ u + 7 ∣

\int \frac{5}{u ( u + 7 )} d u = 5 (\frac{1}{7} ln ∣ u ∣ - \frac{1}{7} ln ∣ u + 7 ∣)

= ln ∣ u + 7 ∣ + 5 (\frac{1}{7} ln ∣ u ∣ - \frac{1}{7} ln ∣ u + 7 ∣)

Setze in

u = x - 1

ein

= ln ∣ x - 1 + 7 ∣ + 5 (\frac{1}{7} ln ∣ x - 1 ∣ - \frac{1}{7} ln ∣ x - 1 + 7 ∣)

Vereinfache

ln ∣ x - 1 + 7 ∣ + 5 (\frac{1}{7} ln ∣ x - 1 ∣ - \frac{1}{7} ln ∣ x - 1 + 7 ∣) : ln ∣ x + 6 ∣ + 5 (\frac{1}{7} ln ∣ x - 1 ∣ - \frac{1}{7} ln ∣ x + 6 ∣)

= ln ∣ x + 6 ∣ + 5 (\frac{1}{7} ln ∣ x - 1 ∣ - \frac{1}{7} ln ∣ x + 6 ∣)

Füge eine Konstante zur Lösung hinzu

= ln ∣ x + 6 ∣ + 5 (\frac{1}{7} ln ∣ x - 1 ∣ - \frac{1}{7} ln ∣ x + 6 ∣) + C

\frac{d y}{d x} = 6 x y

\int_{2}^{x} (3 t^{2} - 1) d t

\int \frac{csc ^{4} ( 2 x )}{cot ^{2} ( 2 x )} d x

x \to x + 2 lim (2 x^{2} + 3 x - 2)

(\frac{sin ( x )}{x})^{^{'}}