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

The integral from 0 to 3 of x/(1+x) is 3-2ln(2)

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

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

3 - 2 ln (2)

Decimal

1.61370 \dots

Solution steps

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

Apply u-substitution

: \int_{1}^{4} \frac{u - 1}{u} d u

= \int_{1}^{4} \frac{u - 1}{u} d u

Expand

\frac{u - 1}{u} : 1 - \frac{1}{u}

= \int_{1}^{4} 1 - \frac{1}{u} d u

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int_{1}^{4} 1 d u - \int_{1}^{4} \frac{1}{u} d u

\int_{1}^{4} 1 d u = 3

\int_{1}^{4} \frac{1}{u} d u = 2 ln (2)

= 3 - 2 ln (2)

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What is the integral from 0 to 3 of x/(1+x) ?
The integral from 0 to 3 of x/(1+x) is 3-2ln(2)