What is the integral from 1 to e of 9x^2ln(x) ?

The integral from 1 to e of 9x^2ln(x) is 2e^3+1

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integral from 1 to e of 9x^2ln(x)

\int_{1}^{e} 9 x^{2} ln (x) d x

2 e^{3} + 1

Decimal

41.17107 \dots

Solution steps

\int_{1}^{e} 9 x^{2} ln (x) d x

Take the constant out:

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

= 9 \cdot \int_{1}^{e} x^{2} ln (x) d x

Apply Integration By Parts

: [\frac{1}{3} (x^{3} ln (x) - 3 \cdot \int \frac{x ^{2}}{3} d x)]_{1}^{e}

= 9 [\frac{1}{3} (x^{3} ln (x) - 3 \cdot \int \frac{x ^{2}}{3} d x)]_{1}^{e}

\int \frac{x ^{2}}{3} d x = \frac{x ^{3}}{9}

= 9 [\frac{1}{3} (x^{3} ln (x) - 3 \cdot \frac{x ^{3}}{9})]_{1}^{e}

3 \cdot \frac{x ^{3}}{9} = \frac{x ^{3}}{3}

= 9 [\frac{1}{3} (x^{3} ln (x) - \frac{x ^{3}}{3})]_{1}^{e}

Compute the boundaries:

\frac{2 e ^{3}}{9} + \frac{1}{9}

= 9 (\frac{2 e ^{3}}{9} + \frac{1}{9})

Simplify

= 2 e^{3} + 1

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What is the integral from 1 to e of 9x^2ln(x) ?
The integral from 1 to e of 9x^2ln(x) is 2e^3+1