What is the integral of (x+5)/(x^2+9) ?

The integral of (x+5)/(x^2+9) is 1/2 ln|x^2+9|+5/3 arctan(x/3)+C

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integral of (x+5)/(x^2+9)

\int \frac{x + 5}{x ^{2} + 9} d x

\frac{1}{2} ln x^{2} + 9 + \frac{5}{3} arctan (\frac{x}{3}) + C

Solution steps

\int \frac{x + 5}{x ^{2} + 9} d x

Expand

\frac{x + 5}{x ^{2} + 9} : \frac{x}{x ^{2} + 9} + \frac{5}{x ^{2} + 9}

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{x}{x ^{2} + 9} d x + \int \frac{5}{x ^{2} + 9} d x

\int \frac{x}{x ^{2} + 9} d x = \frac{1}{2} ln x^{2} + 9

\int \frac{5}{x ^{2} + 9} d x = \frac{5}{3} arctan (\frac{x}{3})

= \frac{1}{2} ln x^{2} + 9 + \frac{5}{3} arctan (\frac{x}{3})

Add a constant to the solution

= \frac{1}{2} ln x^{2} + 9 + \frac{5}{3} arctan (\frac{x}{3}) + C

x \to 2 lim (f (x) + g (x))

\frac{1}{x - 8}

\int \frac{6 x ^{3} + 2 x ^{2} - 45 x - 15}{x ^{2} - 9} d x

6 - x

n = 0 \sum \infty \frac{n ^{2}}{2 ^{n}}

What is the integral of (x+5)/(x^2+9) ?
The integral of (x+5)/(x^2+9) is 1/2 ln|x^2+9|+5/3 arctan(x/3)+C