What is the integral from 0 to 5 of (x^3)/(x^2+1) ?

The integral from 0 to 5 of (x^3)/(x^2+1) is 1/2 (25-ln(26))

integral from 0 to 5 of (x^3)/(x^2+1)

\int_{0}^{5} \frac{x ^{3}}{x ^{2} + 1} d x

\frac{1}{2} (25 - ln (26))

Decimal

10.87095 \dots

Solution steps

\int_{0}^{5} \frac{x ^{3}}{x ^{2} + 1} d x

Apply u-substitution

= \int_{1}^{26} \frac{u - 1}{2 u} d u

Take the constant out:

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

= \frac{1}{2} \cdot \int_{1}^{26} \frac{u - 1}{u} d u

Expand

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

= \frac{1}{2} \cdot \int_{1}^{26} 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

= \frac{1}{2} (\int_{1}^{26} 1 d u - \int_{1}^{26} \frac{1}{u} d u)

\int_{1}^{26} 1 d u = 25

\int_{1}^{26} \frac{1}{u} d u = ln (26)

= \frac{1}{2} (25 - ln (26))

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What is the integral from 0 to 5 of (x^3)/(x^2+1) ?
The integral from 0 to 5 of (x^3)/(x^2+1) is 1/2 (25-ln(26))