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人気のある代数 >

-4.9x^2-8x+30=0

解

- 4.9 x^{2} - 8 x + 30 = 0

解

x = - \frac{10 ( 4 + 163 )}{49}, x = \frac{10 ( 163 - 4 )}{49}

+1

十進法表記

x = - 3.42186 \dots, x = 1.78921 \dots

解答ステップ

- 4.9 x^{2} - 8 x + 30 = 0

以下で両辺を乗じる:

10

- 49 x^{2} - 80 x + 300 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 80 ) \pm ( - 80 ) ^{2} - 4 ( - 49 ) \cdot 300}{2 ( - 49 )}

(- 80)^{2} - 4 (- 49) \cdot 300 = 20163

x_{1, 2} = \frac{- ( - 80 ) \pm 20 163}{2 ( - 49 )}

解を分離する

x_{1} = \frac{- ( - 80 ) + 20 163}{2 ( - 49 )}, x_{2} = \frac{- ( - 80 ) - 20 163}{2 ( - 49 )}

x = \frac{- ( - 80 ) + 20 163}{2 ( - 49 )} : - \frac{10 ( 4 + 163 )}{49}

x = \frac{- ( - 80 ) - 20 163}{2 ( - 49 )} : \frac{10 ( 163 - 4 )}{49}

二次equationの解:

x = - \frac{10 ( 4 + 163 )}{49}, x = \frac{10 ( 163 - 4 )}{49}

グラフ

人気の例

2 x + 3 x^{2} = 0

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