integral from-1 to 1 of (1-x)^2

解

\int_{- 1}^{1} (1 - x)^{2} d x

\frac{8}{3}

十進法表記

2.66666 \dots

解答ステップ

\int_{- 1}^{1} (1 - x)^{2} d x

拡張

(1 - x)^{2} : 1 - 2 x + x^{2}

= \int_{- 1}^{1} 1 - 2 x + x^{2} d x

総和規則を適用する:

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

= \int_{- 1}^{1} 1 d x - \int_{- 1}^{1} 2 x d x + \int_{- 1}^{1} x^{2} d x

\int_{- 1}^{1} 1 d x = 2

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

\int_{- 1}^{1} x^{2} d x = \frac{2}{3}

= 2 - 0 + \frac{2}{3}

簡素化

2 - 0 + \frac{2}{3} : \frac{8}{3}

= \frac{8}{3}