What is the integral from 1 to 2 of 9x^2 ?

The integral from 1 to 2 of 9x^2 is 21

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integral from 1 to 2 of 9x^2

\int_{1}^{2} 9 x^{2} d x

21

Solution steps

\int_{1}^{2} 9 x^{2} d x

Take the constant out:

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

= 9 \cdot \int_{1}^{2} x^{2} d x

Apply the Power Rule

: [\frac{x ^{3}}{3}]_{1}^{2}

= 9 [\frac{x ^{3}}{3}]_{1}^{2}

Compute the boundaries:

\frac{7}{3}

= 9 \cdot \frac{7}{3}

Simplify

= 21

\int_{1}^{n} \frac{[ x ]}{x} d x

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What is the integral from 1 to 2 of 9x^2 ?
The integral from 1 to 2 of 9x^2 is 21