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

The integral of 2/(4x+1) is 1/2 ln|4x+1|+C

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integral of 2/(4x+1)

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

\frac{1}{2} ln ∣ 4 x + 1 ∣ + C

Solution steps

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

Take the constant out:

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

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

Apply u-substitution

: \int \frac{1}{4 u} d u

= 2 \cdot \int \frac{1}{4 u} d u

Take the constant out:

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

= 2 \cdot \frac{1}{4} \cdot \int \frac{1}{u} d u

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 2 \cdot \frac{1}{4} ln ∣ u ∣

Substitute back

u = 4 x + 1

= 2 \cdot \frac{1}{4} ln ∣ 4 x + 1 ∣

Simplify

2 \cdot \frac{1}{4} ln ∣ 4 x + 1 ∣ : \frac{1}{2} ln ∣ 4 x + 1 ∣

= \frac{1}{2} ln ∣ 4 x + 1 ∣

Add a constant to the solution

= \frac{1}{2} ln ∣ 4 x + 1 ∣ + C

y = \frac{x}{x + 3}, (4, \frac{2}{7})

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x \to \infty lim (6)

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