What is the integral from 0 to 7 of (2x)/(x^2+1) ?

The integral from 0 to 7 of (2x)/(x^2+1) is ln(50)

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integral from 0 to 7 of (2x)/(x^2+1)

\int_{0}^{7} \frac{2 x}{x ^{2} + 1} d x

ln (50)

Decimal

3.91202 \dots

Solution steps

\int_{0}^{7} \frac{2 x}{x ^{2} + 1} d x

Take the constant out:

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

= 2 \cdot \int_{0}^{7} \frac{x}{x ^{2} + 1} d x

Apply u-substitution

= 2 \cdot \int_{1}^{50} \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_{1}^{50} \frac{1}{u} d u

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 2 \cdot \frac{1}{2} [ln ∣ u ∣]_{1}^{50}

Simplify

2 \cdot \frac{1}{2} [ln ∣ u ∣]_{1}^{50} : [ln ∣ u ∣]_{1}^{50}

= [ln ∣ u ∣]_{1}^{50}

Compute the boundaries:

ln (50)

= ln (50)

What is the integral from 0 to 7 of (2x)/(x^2+1) ?
The integral from 0 to 7 of (2x)/(x^2+1) is ln(50)