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人気のある代数 >

-2x^2-12x-8=0

解

- 2 x^{2} - 12 x - 8 = 0

解

x = - 3 - 5, x = - 3 + 5

+1

十進法表記

x = - 5.23606 \dots, x = - 0.76393 \dots

解答ステップ

- 2 x^{2} - 12 x - 8 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 12 ) \pm ( - 12 ) ^{2} - 4 ( - 2 ) ( - 8 )}{2 ( - 2 )}

(- 12)^{2} - 4 (- 2) (- 8) = 45

x_{1, 2} = \frac{- ( - 12 ) \pm 4 5}{2 ( - 2 )}

解を分離する

x_{1} = \frac{- ( - 12 ) + 4 5}{2 ( - 2 )}, x_{2} = \frac{- ( - 12 ) - 4 5}{2 ( - 2 )}

x = \frac{- ( - 12 ) + 4 5}{2 ( - 2 )} : - 3 - 5

x = \frac{- ( - 12 ) - 4 5}{2 ( - 2 )} : - 3 + 5

二次equationの解:

x = - 3 - 5, x = - 3 + 5

グラフ

人気の例

(3 x - 7)^{2} + 4 = 29

3 x^{2} + 12 x + 20 = 0

4 x^{2} = (x + 1)^{2} + b

solvefor y,(x-1)^2+y^2=0

so l v e f or y, (x - 1)^{2} + y^{2} = 0

completesquare x^2+16x+71

co m pl e t es q u a re x^{2} + 16 x + 71