What is the integral of 1/(1-0.4x) ?

The integral of 1/(1-0.4x) is -2.5ln|1-0.4x|+C

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integral of 1/(1-0.4x)

\int \frac{1}{1 - 0.4 x} d x

- 2.5 ln ∣ 1 - 0.4 x ∣ + C

Solution steps

\int \frac{1}{1 - 0.4 x} d x

Apply u-substitution

: \int - \frac{1}{0.4 u} d u

= \int - \frac{1}{0.4 u} d u

Take the constant out:

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

= - \frac{1}{0.4} \cdot \int \frac{1}{u} d u

Simplify

= - 2.5 \cdot \int \frac{1}{u} d u

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= - 2.5 ln ∣ u ∣

Substitute back

u = 1 - 0.4 x

= - 2.5 ln ∣ 1 - 0.4 x ∣

Add a constant to the solution

= - 2.5 ln ∣ 1 - 0.4 x ∣ + C

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What is the integral of 1/(1-0.4x) ?
The integral of 1/(1-0.4x) is -2.5ln|1-0.4x|+C