What is the integral of 2/(8-5x) ?

The integral of 2/(8-5x) is -2/5 ln|8-5x|+C

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integral of 2/(8-5x)

\int \frac{2}{8 - 5 x} d x

- \frac{2}{5} ln ∣ 8 - 5 x ∣ + C

Solution steps

\int \frac{2}{8 - 5 x} 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}{8 - 5 x} d x

Apply u-substitution

: \int - \frac{1}{5 u} d u

= 2 \cdot \int - \frac{1}{5 u} d u

Take the constant out:

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

= 2 (- \frac{1}{5} \cdot \int \frac{1}{u} d u)

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 2 (- \frac{1}{5} ln ∣ u ∣)

Substitute back

u = 8 - 5 x

= 2 (- \frac{1}{5} ln ∣ 8 - 5 x ∣)

Simplify

2 (- \frac{1}{5} ln ∣ 8 - 5 x ∣) : - \frac{2}{5} ln ∣ 8 - 5 x ∣

= - \frac{2}{5} ln ∣ 8 - 5 x ∣

Add a constant to the solution

= - \frac{2}{5} ln ∣ 8 - 5 x ∣ + C

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