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人気のある代数 >

-2x^2-x+28=0

解

- 2 x^{2} - x + 28 = 0

解

x = - 4, x = \frac{7}{2}

+1

十進法表記

x = - 4, x = 3.5

解答ステップ

- 2 x^{2} - x + 28 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 1 ) \pm ( - 1 ) ^{2} - 4 ( - 2 ) \cdot 28}{2 ( - 2 )}

(- 1)^{2} - 4 (- 2) \cdot 28 = 15

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

解を分離する

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

x = \frac{- ( - 1 ) + 15}{2 ( - 2 )} : - 4

x = \frac{- ( - 1 ) - 15}{2 ( - 2 )} : \frac{7}{2}

二次equationの解:

x = - 4, x = \frac{7}{2}

グラフ

人気の例

x (- 5 + x) = 3

7 x^{2} = 7

solvefor x,x^2-9y^2+2x-54y=80

so l v e f or x, x^{2} - 9 y^{2} + 2 x - 54 y = 80

5 x - x^{2} = 2 x - 3

-4x^2-40x-280=0

- 4 x^{2} - 40 x - 280 = 0