What is the integral of (x+7)/(x^2+16) ?

The integral of (x+7)/(x^2+16) is 1/2 ln|x^2+16|+7/4 arctan(x/4)+C

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integral of (x+7)/(x^2+16)

\int \frac{x + 7}{x ^{2} + 16} d x

\frac{1}{2} ln x^{2} + 16 + \frac{7}{4} arctan (\frac{x}{4}) + C

Solution steps

\int \frac{x + 7}{x ^{2} + 16} d x

Expand

\frac{x + 7}{x ^{2} + 16} : \frac{x}{x ^{2} + 16} + \frac{7}{x ^{2} + 16}

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} + 16} d x + \int \frac{7}{x ^{2} + 16} d x

\int \frac{x}{x ^{2} + 16} d x = \frac{1}{2} ln x^{2} + 16

\int \frac{7}{x ^{2} + 16} d x = \frac{7}{4} arctan (\frac{x}{4})

= \frac{1}{2} ln x^{2} + 16 + \frac{7}{4} arctan (\frac{x}{4})

Add a constant to the solution

= \frac{1}{2} ln x^{2} + 16 + \frac{7}{4} arctan (\frac{x}{4}) + C

x \to - 4 lim (\frac{1}{x + 4})

f (x) = (3 x + 2)^{2}

\frac{d}{d x} (2 sin (x) + cos (2 x))

\int 2 x (x^{2} + 12)^{4} d x

f (x) = \frac{2}{x}, at x = 4

What is the integral of (x+7)/(x^2+16) ?
The integral of (x+7)/(x^2+16) is 1/2 ln|x^2+16|+7/4 arctan(x/4)+C