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人気のある代数 >

0=-2x^2-4x-1

解

0 = - 2 x^{2} - 4 x - 1

解

x = - \frac{2 + 2}{2}, x = - \frac{2 - 2}{2}

+1

十進法表記

x = - 1.70710 \dots, x = - 0.29289 \dots

解答ステップ

0 = - 2 x^{2} - 4 x - 1

辺を交換する

- 2 x^{2} - 4 x - 1 = 0

解くとthe二次式

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

(- 4)^{2} - 4 (- 2) (- 1) = 22

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

解を分離する

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

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

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

二次equationの解:

x = - \frac{2 + 2}{2}, x = - \frac{2 - 2}{2}

グラフ

人気の例

x^2=300^2+400^2

x^{2} = 30 0^{2} + 40 0^{2}

log_{10}(5)(x^2+10x+1)=2

lo g_{10} (5) (x^{2} + 10 x + 1) = 2

x^{2} + 20 = 9 x

completesquare 2x^2+8x+11

co m pl e t es q u a re 2 x^{2} + 8 x + 11

x^{2} + 4 = 16