What is the integral of 4/(3+2x) ?

The integral of 4/(3+2x) is 2ln|3+2x|+C

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integral of 4/(3+2x)

\int \frac{4}{3 + 2 x} d x

2 ln ∣ 3 + 2 x ∣ + C

Solution steps

\int \frac{4}{3 + 2 x} d x

Take the constant out:

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

= 4 \cdot \int \frac{1}{3 + 2 x} d x

Apply u-substitution

: \int \frac{1}{2 u} d u

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

Take the constant out:

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

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 4 \cdot \frac{1}{2} ln ∣ u ∣

Substitute back

u = 3 + 2 x

= 4 \cdot \frac{1}{2} ln ∣ 3 + 2 x ∣

Simplify

4 \cdot \frac{1}{2} ln ∣ 3 + 2 x ∣ : 2 ln ∣ 3 + 2 x ∣

= 2 ln ∣ 3 + 2 x ∣

Add a constant to the solution

= 2 ln ∣ 3 + 2 x ∣ + C

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