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人気のある代数 >

x^2-0.4x-0.04=0

解

x^{2} - 0.4 x - 0.04 = 0

解

x = \frac{1 + 2}{5}, x = \frac{1 - 2}{5}

+1

十進法表記

x = 0.48284 \dots, x = - 0.08284 \dots

解答ステップ

x^{2} - 0.4 x - 0.04 = 0

以下で両辺を乗じる:

100

100 x^{2} - 40 x - 4 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 40 ) \pm ( - 40 ) ^{2} - 4 \cdot 100 ( - 4 )}{2 \cdot 100}

(- 40)^{2} - 4 \cdot 100 (- 4) = 402

x_{1, 2} = \frac{- ( - 40 ) \pm 40 2}{2 \cdot 100}

解を分離する

x_{1} = \frac{- ( - 40 ) + 40 2}{2 \cdot 100}, x_{2} = \frac{- ( - 40 ) - 40 2}{2 \cdot 100}

x = \frac{- ( - 40 ) + 40 2}{2 \cdot 100} : \frac{1 + 2}{5}

x = \frac{- ( - 40 ) - 40 2}{2 \cdot 100} : \frac{1 - 2}{5}

二次equationの解:

x = \frac{1 + 2}{5}, x = \frac{1 - 2}{5}

グラフ

人気の例

40 x^{2} + 33 x - 18 = 0

- 8 x^{2} + 26 x - 15 = 0

x (x - 2) = 2 x - 2

(x-2)^2-6=-(x+2)(x+1)

(x - 2)^{2} - 6 = - (x + 2) (x + 1)

x^{2} + 13 x - 420 = 0