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人気のある代数 >

-7x^2-25x+12=0

解

- 7 x^{2} - 25 x + 12 = 0

解

x = - 4, x = \frac{3}{7}

+1

十進法表記

x = - 4, x = 0.42857 \dots

解答ステップ

- 7 x^{2} - 25 x + 12 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 25 ) \pm ( - 25 ) ^{2} - 4 ( - 7 ) \cdot 12}{2 ( - 7 )}

(- 25)^{2} - 4 (- 7) \cdot 12 = 31

x_{1, 2} = \frac{- ( - 25 ) \pm 31}{2 ( - 7 )}

解を分離する

x_{1} = \frac{- ( - 25 ) + 31}{2 ( - 7 )}, x_{2} = \frac{- ( - 25 ) - 31}{2 ( - 7 )}

x = \frac{- ( - 25 ) + 31}{2 ( - 7 )} : - 4

x = \frac{- ( - 25 ) - 31}{2 ( - 7 )} : \frac{3}{7}

二次equationの解:

x = - 4, x = \frac{3}{7}

グラフ

人気の例

3 m^{2} - 6 m + 6 = 0

X^{2} - X - 6 = 9

x^2-5/6 x= 25/6

x^{2} - \frac{5}{6} x = \frac{25}{6}

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