What is the integral from 1 to 2 of x*e^{2x} ?

The integral from 1 to 2 of x*e^{2x} is (3e^4-e^2)/4

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integral from 1 to 2 of x*e^{2x}

\int_{1}^{2} x \cdot e^{2 x} d x

\frac{3 e ^{4} - e ^{2}}{4}

Decimal

39.10134 \dots

Solution steps

\int_{1}^{2} x e^{2 x} d x

Apply u-substitution

= \int_{2}^{4} \frac{e ^{u} u}{4} d u

Take the constant out:

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

= \frac{1}{4} \cdot \int_{2}^{4} e^{u} u d u

Apply Integration By Parts

= \frac{1}{4} [e^{u} u - \int e^{u} d u]_{2}^{4}

\int e^{u} d u = e^{u}

= \frac{1}{4} [e^{u} u - e^{u}]_{2}^{4}

Compute the boundaries:

3 e^{4} - e^{2}

= \frac{1}{4} (3 e^{4} - e^{2})

Simplify

= \frac{3 e ^{4} - e ^{2}}{4}

What is the integral from 1 to 2 of x*e^{2x} ?
The integral from 1 to 2 of x*e^{2x} is (3e^4-e^2)/4