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人気のある代数 >

-2x^2-12x+18=0

解

- 2 x^{2} - 12 x + 18 = 0

解

x = - 3 (1 + 2), x = 3 (2 - 1)

+1

十進法表記

x = - 7.24264 \dots, x = 1.24264 \dots

解答ステップ

- 2 x^{2} - 12 x + 18 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 12 ) \pm ( - 12 ) ^{2} - 4 ( - 2 ) \cdot 18}{2 ( - 2 )}

(- 12)^{2} - 4 (- 2) \cdot 18 = 122

x_{1, 2} = \frac{- ( - 12 ) \pm 12 2}{2 ( - 2 )}

解を分離する

x_{1} = \frac{- ( - 12 ) + 12 2}{2 ( - 2 )}, x_{2} = \frac{- ( - 12 ) - 12 2}{2 ( - 2 )}

x = \frac{- ( - 12 ) + 12 2}{2 ( - 2 )} : - 3 (1 + 2)

x = \frac{- ( - 12 ) - 12 2}{2 ( - 2 )} : 3 (2 - 1)

二次equationの解:

x = - 3 (1 + 2), x = 3 (2 - 1)

グラフ

人気の例

- 3 x^{2} + 10 x + 8 = 0

x^{2} = 1.44

3((x+2)^2-7-8/3)=0

3 ((x + 2)^{2} - 7 - \frac{8}{3}) = 0

x^{2} = 1 - 8 x

2 - x^{2} = x^{2} - 16