What is the integral of 1/(x^2+4x+20) ?

The integral of 1/(x^2+4x+20) is 1/4 arctan((x+2)/4)+C

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integral of 1/(x^2+4x+20)

\int \frac{1}{x ^{2} + 4 x + 20} d x

\frac{1}{4} arctan (\frac{x + 2}{4}) + C

Solution steps

\int \frac{1}{x ^{2} + 4 x + 20} d x

Complete the square

x^{2} + 4 x + 20 : (x + 2)^{2} + 16

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

Apply u-substitution

: \int \frac{1}{u ^{2} + 16} d u

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

Apply Integral Substitution

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

Take the constant out:

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

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

Use the common integral:

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

= \frac{1}{4} arctan (v)

Substitute back

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

Add a constant to the solution

= \frac{1}{4} arctan (\frac{x + 2}{4}) + C

x \to 1 lim (e^{x})

x \to 5 lim (x^{- 1})

\frac{d}{d x} (2 x - 4 sin (x))

A x^{n} + B e^{x}

\frac{d}{d x} (\frac{x ^{2}}{x - 3})

What is the integral of 1/(x^2+4x+20) ?
The integral of 1/(x^2+4x+20) is 1/4 arctan((x+2)/4)+C