What is the integral from-2 to 2 of 8/(x^2+4) ?

The integral from-2 to 2 of 8/(x^2+4) is 2pi

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integral from-2 to 2 of 8/(x^2+4)

\int_{- 2}^{2} \frac{8}{x ^{2} + 4} d x

2 π

Decimal

6.28318 \dots

Solution steps

\int_{- 2}^{2} \frac{8}{x ^{2} + 4} d x

Take the constant out:

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

= 8 \cdot \int_{- 2}^{2} \frac{1}{x ^{2} + 4} d x

Apply Integral Substitution

= 8 \cdot \int_{- 1}^{1} \frac{1}{2 ( u ^{2} + 1 )} d u

Take the constant out:

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

= 8 \cdot \frac{1}{2} \cdot \int_{- 1}^{1} \frac{1}{u ^{2} + 1} d u

Use the common integral:

\int \frac{1}{u ^{2} + 1} d u = arctan (u)

= 8 \cdot \frac{1}{2} [arctan (u)]_{- 1}^{1}

Simplify

8 \cdot \frac{1}{2} [arctan (u)]_{- 1}^{1} : 4 [arctan (u)]_{- 1}^{1}

= 4 [arctan (u)]_{- 1}^{1}

Compute the boundaries:

\frac{π}{2}

= 4 \cdot \frac{π}{2}

Simplify

= 2 π

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What is the integral from-2 to 2 of 8/(x^2+4) ?
The integral from-2 to 2 of 8/(x^2+4) is 2pi