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人気のある代数 >

-2x^2+2x+7=0

解

- 2 x^{2} + 2 x + 7 = 0

解

x = - \frac{- 1 + 15}{2}, x = \frac{1 + 15}{2}

+1

十進法表記

x = - 1.43649 \dots, x = 2.43649 \dots

解答ステップ

- 2 x^{2} + 2 x + 7 = 0

解くとthe二次式

x_{1, 2} = \frac{- 2 \pm 2 ^{2} - 4 ( - 2 ) \cdot 7}{2 ( - 2 )}

2^{2} - 4 (- 2) \cdot 7 = 215

x_{1, 2} = \frac{- 2 \pm 2 15}{2 ( - 2 )}

解を分離する

x_{1} = \frac{- 2 + 2 15}{2 ( - 2 )}, x_{2} = \frac{- 2 - 2 15}{2 ( - 2 )}

x = \frac{- 2 + 2 15}{2 ( - 2 )} : - \frac{- 1 + 15}{2}

x = \frac{- 2 - 2 15}{2 ( - 2 )} : \frac{1 + 15}{2}

二次equationの解:

x = - \frac{- 1 + 15}{2}, x = \frac{1 + 15}{2}

グラフ

人気の例

x (x + 2) = e^{4}

(5 x - 1) (x + 1) = 0

x^{2} + 5 = 40

2 x^{2} - 7 + 3 = 0

u^{2} + 10 u + 21 = 0