What is the integral from 3 to 9 of 8/x ?

The integral from 3 to 9 of 8/x is 8ln(3)

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integral from 3 to 9 of 8/x

\int_{3}^{9} \frac{8}{x} d x

8 ln (3)

Decimal

8.78889 \dots

Solution steps

\int_{3}^{9} \frac{8}{x} d x

Take the constant out:

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

= 8 \cdot \int_{3}^{9} \frac{1}{x} d x

Use the common integral:

\int \frac{1}{x} d x = ln (∣ x ∣)

= 8 [ln ∣ x ∣]_{3}^{9}

Compute the boundaries:

ln (3)

= 8 ln (3)

What is the integral from 3 to 9 of 8/x ?
The integral from 3 to 9 of 8/x is 8ln(3)