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人気のある代数 >

-8x^2-15x+2=0

解

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

解

x = - 2, x = \frac{1}{8}

+1

十進法表記

x = - 2, x = 0.125

解答ステップ

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

解くとthe二次式

x_{1, 2} = \frac{- ( - 15 ) \pm ( - 15 ) ^{2} - 4 ( - 8 ) \cdot 2}{2 ( - 8 )}

(- 15)^{2} - 4 (- 8) \cdot 2 = 17

x_{1, 2} = \frac{- ( - 15 ) \pm 17}{2 ( - 8 )}

解を分離する

x_{1} = \frac{- ( - 15 ) + 17}{2 ( - 8 )}, x_{2} = \frac{- ( - 15 ) - 17}{2 ( - 8 )}

x = \frac{- ( - 15 ) + 17}{2 ( - 8 )} : - 2

x = \frac{- ( - 15 ) - 17}{2 ( - 8 )} : \frac{1}{8}

二次equationの解:

x = - 2, x = \frac{1}{8}

グラフ

人気の例

x^{2} + 11 x - 42 = 0

3 p^{2} + 12 p - 4 = 0

3x^2-4x-1=2x^2-5

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completesquare 4x^2+3x=x(2x-2)

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