What is the integral from 0 to 3 of x/(1+4x^2) ?

The integral from 0 to 3 of x/(1+4x^2) is 1/8 ln(37)

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integral from 0 to 3 of x/(1+4x^2)

\int_{0}^{3} \frac{x}{1 + 4 x ^{2}} d x

\frac{1}{8} ln (37)

Decimal

0.45136 \dots

Solution steps

\int_{0}^{3} \frac{x}{1 + 4 x ^{2}} d x

Apply u-substitution

: \int_{1}^{37} \frac{1}{8 u} d u

= \int_{1}^{37} \frac{1}{8 u} d u

Take the constant out:

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

= \frac{1}{8} \cdot \int_{1}^{37} \frac{1}{u} d u

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= \frac{1}{8} [ln ∣ u ∣]_{1}^{37}

Compute the boundaries:

ln (37)

= \frac{1}{8} ln (37)

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What is the integral from 0 to 3 of x/(1+4x^2) ?
The integral from 0 to 3 of x/(1+4x^2) is 1/8 ln(37)