What is the integral of ((2x+7)/(x^2+2x+5)) ?

The integral of ((2x+7)/(x^2+2x+5)) is ln|x^2+2x+5|+5/2 arctan(1/2 (x+1))+C

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integral of ((2x+7)/(x^2+2x+5))

\int (\frac{2 x + 7}{x ^{2} + 2 x + 5}) d x

ln x^{2} + 2 x + 5 + \frac{5}{2} arctan (\frac{1}{2} (x + 1)) + C

Solution steps

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

Complete the square

x^{2} + 2 x + 5 : (x + 1)^{2} + 4

= \int \frac{2 x + 7}{( x + 1 ) ^{2} + 4} d x

Apply u-substitution

: \int \frac{2 u + 5}{u ^{2} + 4} d u

= \int \frac{2 u + 5}{u ^{2} + 4} d u

Expand

\frac{2 u + 5}{u ^{2} + 4} : \frac{2 u}{u ^{2} + 4} + \frac{5}{u ^{2} + 4}

Apply the Sum Rule:

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

= \int \frac{2 u}{u ^{2} + 4} d u + \int \frac{5}{u ^{2} + 4} d u

\int \frac{2 u}{u ^{2} + 4} d u = ln u^{2} + 4

\int \frac{5}{u ^{2} + 4} d u = \frac{5}{2} arctan (\frac{u}{2})

= ln u^{2} + 4 + \frac{5}{2} arctan (\frac{u}{2})

Substitute back

u = x + 1

= ln (x + 1)^{2} + 4 + \frac{5}{2} arctan (\frac{x + 1}{2})

Simplify

ln (x + 1)^{2} + 4 + \frac{5}{2} arctan (\frac{x + 1}{2}) : ln x^{2} + 2 x + 5 + \frac{5}{2} arctan (\frac{1}{2} (x + 1))

= ln x^{2} + 2 x + 5 + \frac{5}{2} arctan (\frac{1}{2} (x + 1))

Add a constant to the solution

= ln x^{2} + 2 x + 5 + \frac{5}{2} arctan (\frac{1}{2} (x + 1)) + C

\frac{3 x}{( x + 1 ) ^{2}} (0)

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(x^{4} - sec (4 x^{2} - 2))^{- 4}

\frac{\partial}{\partial x} (\frac{y}{x ^{2}})

\int_{0}^{10} t e^{- 0.6 t} d t

What is the integral of ((2x+7)/(x^2+2x+5)) ?
The integral of ((2x+7)/(x^2+2x+5)) is ln|x^2+2x+5|+5/2 arctan(1/2 (x+1))+C