What is the integral of 2/(100+2t) ?

The integral of 2/(100+2t) is ln|100+2t|+C

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integral of 2/(100+2t)

\int \frac{2}{100 + 2 t} d t

ln ∣ 100 + 2 t ∣ + C

Solution steps

\int \frac{2}{100 + 2 t} d t

Take the constant out:

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

= 2 \cdot \int \frac{1}{100 + 2 t} d t

Apply u-substitution

= 2 \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

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 2 \cdot \frac{1}{2} ln ∣ u ∣

Substitute back

u = 100 + 2 t

= 2 \cdot \frac{1}{2} ln ∣ 100 + 2 t ∣

Simplify

2 \cdot \frac{1}{2} ln ∣ 100 + 2 t ∣ : ln ∣ 100 + 2 t ∣

= ln ∣ 100 + 2 t ∣

Add a constant to the solution

= ln ∣ 100 + 2 t ∣ + C

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