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

The integral from 1 to 3 of (2x)/((x^2+4)^3) is 72/4225

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

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

\frac{72}{4225}

Decimal

0.01704 \dots

Solution steps

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

Take the constant out:

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

= 2 \cdot \int_{1}^{3} \frac{x}{( x ^{2} + 4 ) ^{3}} d x

Apply u-substitution

= 2 \cdot \int_{5}^{13} \frac{1}{2 u ^{3}} 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_{5}^{13} \frac{1}{u ^{3}} d u

Apply the Power Rule

= 2 \cdot \frac{1}{2} [- \frac{1}{2 u ^{2}}]_{5}^{13}

Simplify

2 \cdot \frac{1}{2} [- \frac{1}{2 u ^{2}}]_{5}^{13} : [- \frac{1}{2 u ^{2}}]_{5}^{13}

= [- \frac{1}{2 u ^{2}}]_{5}^{13}

Compute the boundaries:

\frac{72}{4225}

= \frac{72}{4225}

What is the integral from 1 to 3 of (2x)/((x^2+4)^3) ?
The integral from 1 to 3 of (2x)/((x^2+4)^3) is 72/4225