What is the integral from 0 to 2 of x^2sqrt(1-0.5x) ?

The integral from 0 to 2 of x^2sqrt(1-0.5x) is 128/105

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integral from 0 to 2 of x^2sqrt(1-0.5x)

\int_{0}^{2} x^{2} 1 - 0.5 x d x

\frac{128}{105}

Decimal

1.21904 \dots

Solution steps

\int_{0}^{2} x^{2} 1 - 0.5 x d x

Apply u-substitution

= \int_{1}^{0} - \frac{4 u ( u - 1 ) ^{2}}{0.5} d u

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

= - \int_{0}^{1} - \frac{4 u ( u - 1 ) ^{2}}{0.5} d u

Take the constant out:

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

= - (- \frac{4}{0.5} \cdot \int_{0}^{1} u (u - 1)^{2} d u)

Simplify

= - (- 8 \cdot \int_{0}^{1} u (u - 1)^{2} d u)

Expand

u (u - 1)^{2} : u^{\frac{5}{2}} - 2 u^{\frac{3}{2}} + u

= - (- 8 \cdot \int_{0}^{1} u^{\frac{5}{2}} - 2 u^{\frac{3}{2}} + u d u)

Apply the Sum Rule:

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

= - (- 8 (\int_{0}^{1} u^{\frac{5}{2}} d u - \int_{0}^{1} 2 u^{\frac{3}{2}} d u + \int_{0}^{1} u d u))

\int_{0}^{1} u^{\frac{5}{2}} d u = \frac{2}{7}

\int_{0}^{1} 2 u^{\frac{3}{2}} d u = \frac{4}{5}

\int_{0}^{1} u d u = \frac{2}{3}

= - (- 8 (\frac{2}{7} - \frac{4}{5} + \frac{2}{3}))

Simplify

- (- 8 (\frac{2}{7} - \frac{4}{5} + \frac{2}{3})) : \frac{128}{105}

= \frac{128}{105}

What is the integral from 0 to 2 of x^2sqrt(1-0.5x) ?
The integral from 0 to 2 of x^2sqrt(1-0.5x) is 128/105