What is the integral of 9/(x^2+4) ?

The integral of 9/(x^2+4) is 9/2 arctan(x/2)+C

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integral of 9/(x^2+4)

\int \frac{9}{x ^{2} + 4} d x

\frac{9}{2} arctan (\frac{x}{2}) + C

Solution steps

\int \frac{9}{x ^{2} + 4} d x

Take the constant out:

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

= 9 \cdot \int \frac{1}{x ^{2} + 4} d x

Apply Integral Substitution

= 9 \cdot \int \frac{1}{2 ( u ^{2} + 1 )} d u

Take the constant out:

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

= 9 \cdot \frac{1}{2} \cdot \int \frac{1}{u ^{2} + 1} d u

Use the common integral:

\int \frac{1}{u ^{2} + 1} d u = arctan (u)

= 9 \cdot \frac{1}{2} arctan (u)

Substitute back

u = \frac{x}{2}

= 9 \cdot \frac{1}{2} arctan (\frac{x}{2})

Simplify

9 \cdot \frac{1}{2} arctan (\frac{x}{2}) : \frac{9}{2} arctan (\frac{x}{2})

= \frac{9}{2} arctan (\frac{x}{2})

Add a constant to the solution

= \frac{9}{2} arctan (\frac{x}{2}) + C

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What is the integral of 9/(x^2+4) ?
The integral of 9/(x^2+4) is 9/2 arctan(x/2)+C