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人気のある代数 >

-x^2-18x+20=0

解

- x^{2} - 18 x + 20 = 0

解

x = - 9 - 101, x = 101 - 9

+1

十進法表記

x = - 19.04987 \dots, x = 1.04987 \dots

解答ステップ

- x^{2} - 18 x + 20 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 18 ) \pm ( - 18 ) ^{2} - 4 ( - 1 ) \cdot 20}{2 ( - 1 )}

(- 18)^{2} - 4 (- 1) \cdot 20 = 2101

x_{1, 2} = \frac{- ( - 18 ) \pm 2 101}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- ( - 18 ) + 2 101}{2 ( - 1 )}, x_{2} = \frac{- ( - 18 ) - 2 101}{2 ( - 1 )}

x = \frac{- ( - 18 ) + 2 101}{2 ( - 1 )} : - 9 - 101

x = \frac{- ( - 18 ) - 2 101}{2 ( - 1 )} : 101 - 9

二次equationの解:

x = - 9 - 101, x = 101 - 9

グラフ

人気の例

(2 x + 3)^{2} = - 6

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

(3 x + 1) (1 - x) - 3 (x + 1)^{2} = x - 3

6 x^{2} + 10 x - 5 = 0

(x - 3)^{2} - 1 = - \frac{3}{4}

12 x^{2} - 20 x + 5 = 0