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人気のある微分積分 >

integral of (x^3)/(x^2+22x+121)

解

\int \frac{x ^{3}}{x ^{2} + 22 x + 121} d x

解

\frac{1}{2} (x + 11)^{2} - 33 (x + 11) + 363 ln ∣ x + 11 ∣ + \frac{1331}{x + 11} + C

解答ステップ

\int \frac{x ^{3}}{x ^{2} + 22 x + 121} d x

平方完成する

x^{2} + 22 x + 121 : (x + 11)^{2}

= \int \frac{x ^{3}}{( x + 11 ) ^{2}} d x

u置換積分法を適用する

= \int \frac{( u - 11 ) ^{3}}{u ^{2}} d u

拡張

\frac{( u - 11 ) ^{3}}{u ^{2}} : u - 33 + \frac{363}{u} - \frac{1331}{u ^{2}}

= \int u - 33 + \frac{363}{u} - \frac{1331}{u ^{2}} d u

総和規則を適用する:

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

= \int u d u - \int 33 d u + \int \frac{363}{u} d u - \int \frac{1331}{u ^{2}} d u

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

\int 33 d u = 33 u

\int \frac{363}{u} d u = 363 ln ∣ u ∣

\int \frac{1331}{u ^{2}} d u = - \frac{1331}{u}

= \frac{u ^{2}}{2} - 33 u + 363 ln ∣ u ∣ - (- \frac{1331}{u})

代用を戻す

u = x + 11

= \frac{( x + 11 ) ^{2}}{2} - 33 (x + 11) + 363 ln ∣ x + 11 ∣ - (- \frac{1331}{x + 11})

簡素化

\frac{( x + 11 ) ^{2}}{2} - 33 (x + 11) + 363 ln ∣ x + 11 ∣ - (- \frac{1331}{x + 11}) : \frac{1}{2} (x + 11)^{2} - 33 (x + 11) + 363 ln ∣ x + 11 ∣ + \frac{1331}{x + 11}

= \frac{1}{2} (x + 11)^{2} - 33 (x + 11) + 363 ln ∣ x + 11 ∣ + \frac{1331}{x + 11}

定数を解答に追加する

= \frac{1}{2} (x + 11)^{2} - 33 (x + 11) + 363 ln ∣ x + 11 ∣ + \frac{1331}{x + 11} + C

グラフ

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