What is the integral from 2 to 0 of 3x(2-x) ?

The integral from 2 to 0 of 3x(2-x) is -4

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integral from 2 to 0 of 3x(2-x)

\int_{2}^{0} 3 x (2 - x) d x

- 4

Solution steps

\int_{2}^{0} 3 x (2 - x) d x

\int_{a}^{b} f (x) d x = - \int_{b}^{a} f (x) d x, a < b

= - \int_{0}^{2} 3 x (2 - x) d x

Take the constant out:

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

= - 3 \cdot \int_{0}^{2} x (2 - x) d x

Expand

x (2 - x) : 2 x - x^{2}

= - 3 \cdot \int_{0}^{2} 2 x - x^{2} d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= - 3 (\int_{0}^{2} 2 x d x - \int_{0}^{2} x^{2} d x)

\int_{0}^{2} 2 x d x = 4

\int_{0}^{2} x^{2} d x = \frac{8}{3}

= - 3 (4 - \frac{8}{3})

Simplify

- 3 (4 - \frac{8}{3}) : - 4

= - 4

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What is the integral from 2 to 0 of 3x(2-x) ?
The integral from 2 to 0 of 3x(2-x) is -4