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人気のある微分積分 >

integral of (5x-3)/(x^2+7x+6)

解

\int \frac{5 x - 3}{x ^{2} + 7 x + 6} d x

解

4 (5 (\frac{1}{8} ln 4 x^{2} + 28 x + 24 + \frac{7}{40} (ln \frac{12}{5} + \frac{2}{5} x - ln \frac{2}{5} + \frac{2}{5} x)) + \frac{3}{20} (ln \frac{12}{5} + \frac{2}{5} x - ln \frac{2}{5} + \frac{2}{5} x)) + C

解答ステップ

\int \frac{5 x - 3}{x ^{2} + 7 x + 6} d x

平方完成する

x^{2} + 7 x + 6 : (x + \frac{7}{2})^{2} - \frac{25}{4}

= \int \frac{5 x - 3}{( x + \frac{7}{2} ) ^{2} - \frac{25}{4}} d x

u置換積分法を適用する

= \int \frac{4 ( 5 ( u - \frac{7}{2} ) - 3 )}{4 u ^{2} - 25} d u

定数を除く:

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

= 4 \cdot \int \frac{5 ( u - \frac{7}{2} ) - 3}{4 u ^{2} - 25} d u

拡張

\frac{5 ( u - \frac{7}{2} ) - 3}{4 u ^{2} - 25} : \frac{5 ( u - \frac{7}{2} )}{4 u ^{2} - 25} - \frac{3}{4 u ^{2} - 25}

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

= 4 (\int \frac{5 ( u - \frac{7}{2} )}{4 u ^{2} - 25} d u - \int \frac{3}{4 u ^{2} - 25} d u)

\int \frac{5 ( u - \frac{7}{2} )}{4 u ^{2} - 25} d u = 5 (\frac{1}{8} ln 4 u^{2} - 25 + \frac{7}{40} (ln \frac{2}{5} u + 1 - ln \frac{2}{5} u - 1))

\int \frac{3}{4 u ^{2} - 25} d u = - \frac{3}{20} (ln \frac{2}{5} u + 1 - ln \frac{2}{5} u - 1)

= 4 (5 (\frac{1}{8} ln 4 u^{2} - 25 + \frac{7}{40} (ln \frac{2}{5} u + 1 - ln \frac{2}{5} u - 1)) - (- \frac{3}{20} (ln \frac{2}{5} u + 1 - ln \frac{2}{5} u - 1)))

代用を戻す

u = x + \frac{7}{2}

= 4 (5 (\frac{1}{8} ln 4 (x + \frac{7}{2})^{2} - 25 + \frac{7}{40} (ln \frac{2}{5} (x + \frac{7}{2}) + 1 - ln \frac{2}{5} (x + \frac{7}{2}) - 1)) - (- \frac{3}{20} (ln \frac{2}{5} (x + \frac{7}{2}) + 1 - ln \frac{2}{5} (x + \frac{7}{2}) - 1)))

簡素化

4 (5 (\frac{1}{8} ln 4 (x + \frac{7}{2})^{2} - 25 + \frac{7}{40} (ln \frac{2}{5} (x + \frac{7}{2}) + 1 - ln \frac{2}{5} (x + \frac{7}{2}) - 1)) - (- \frac{3}{20} (ln \frac{2}{5} (x + \frac{7}{2}) + 1 - ln \frac{2}{5} (x + \frac{7}{2}) - 1))) : 4 (5 (\frac{1}{8} ln 4 x^{2} + 28 x + 24 + \frac{7}{40} (ln \frac{12}{5} + \frac{2}{5} x - ln \frac{2}{5} + \frac{2}{5} x)) + \frac{3}{20} (ln \frac{12}{5} + \frac{2}{5} x - ln \frac{2}{5} + \frac{2}{5} x))

= 4 (5 (\frac{1}{8} ln 4 x^{2} + 28 x + 24 + \frac{7}{40} (ln \frac{12}{5} + \frac{2}{5} x - ln \frac{2}{5} + \frac{2}{5} x)) + \frac{3}{20} (ln \frac{12}{5} + \frac{2}{5} x - ln \frac{2}{5} + \frac{2}{5} x))

定数を解答に追加する

= 4 (5 (\frac{1}{8} ln 4 x^{2} + 28 x + 24 + \frac{7}{40} (ln \frac{12}{5} + \frac{2}{5} x - ln \frac{2}{5} + \frac{2}{5} x)) + \frac{3}{20} (ln \frac{12}{5} + \frac{2}{5} x - ln \frac{2}{5} + \frac{2}{5} x)) + C

グラフ

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