What is the integral from 4 to 7 of (x+2)/(x^2-5x+6) ?

The integral from 4 to 7 of (x+2)/(x^2-5x+6) is (ln(10)-9ln(5/8))/2

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integral from 4 to 7 of (x+2)/(x^2-5x+6)

\int_{4}^{7} \frac{x + 2}{x ^{2} - 5 x + 6} d x

\frac{ln ( 10 ) - 9 ln ( \frac{5}{8} )}{2}

Solution steps

\int_{4}^{7} \frac{x + 2}{x ^{2} - 5 x + 6} d x

Complete the square

x^{2} - 5 x + 6 : (x - \frac{5}{2})^{2} - \frac{1}{4}

= \int_{4}^{7} \frac{x + 2}{( x - \frac{5}{2} ) ^{2} - \frac{1}{4}} d x

Apply u-substitution

: \int_{\frac{3}{2}}^{\frac{9}{2}} \frac{2 ( 2 u + 9 )}{4 u ^{2} - 1} d u

= \int_{\frac{3}{2}}^{\frac{9}{2}} \frac{2 ( 2 u + 9 )}{4 u ^{2} - 1} d u

Take the constant out:

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

= 2 \cdot \int_{\frac{3}{2}}^{\frac{9}{2}} \frac{2 u + 9}{4 u ^{2} - 1} d u

Expand

\frac{2 u + 9}{4 u ^{2} - 1} : \frac{2 u}{4 u ^{2} - 1} + \frac{9}{4 u ^{2} - 1}

Apply the Sum Rule:

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

= 2 (\int_{\frac{3}{2}}^{\frac{9}{2}} \frac{2 u}{4 u ^{2} - 1} d u + \int_{\frac{3}{2}}^{\frac{9}{2}} \frac{9}{4 u ^{2} - 1} d u)

\int_{\frac{3}{2}}^{\frac{9}{2}} \frac{2 u}{4 u ^{2} - 1} d u = \frac{1}{4} ln (10)

\int_{\frac{3}{2}}^{\frac{9}{2}} \frac{9}{4 u ^{2} - 1} d u = - \frac{9 ln ( \frac{5}{8} )}{4}

= 2 (\frac{1}{4} ln (10) - \frac{9 ln ( \frac{5}{8} )}{4})

Simplify

2 (\frac{1}{4} ln (10) - \frac{9 ln ( \frac{5}{8} )}{4}) : \frac{ln ( 10 ) - 9 ln ( \frac{5}{8} )}{2}

= \frac{ln ( 10 ) - 9 ln ( \frac{5}{8} )}{2}

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What is the integral from 4 to 7 of (x+2)/(x^2-5x+6) ?
The integral from 4 to 7 of (x+2)/(x^2-5x+6) is (ln(10)-9ln(5/8))/2