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人気のある代数 >

0=40+5x-4.9x^2

解

0 = 40 + 5 x - 4.9 x^{2}

解

x = - \frac{5 ( 809 - 5 )}{49}, x = \frac{5 ( 5 + 809 )}{49}

+1

十進法表記

x = - 2.39213 \dots, x = 3.41254 \dots

解答ステップ

0 = 40 + 5 x - 4.9 x^{2}

以下で両辺を乗じる:

10

0 = 400 + 50 x - 49 x^{2}

辺を交換する

400 + 50 x - 49 x^{2} = 0

標準的な形式で書く

a x^{2} + b x + c = 0

- 49 x^{2} + 50 x + 400 = 0

解くとthe二次式

x_{1, 2} = \frac{- 50 \pm 5 0 ^{2} - 4 ( - 49 ) \cdot 400}{2 ( - 49 )}

5 0^{2} - 4 (- 49) \cdot 400 = 10809

x_{1, 2} = \frac{- 50 \pm 10 809}{2 ( - 49 )}

解を分離する

x_{1} = \frac{- 50 + 10 809}{2 ( - 49 )}, x_{2} = \frac{- 50 - 10 809}{2 ( - 49 )}

x = \frac{- 50 + 10 809}{2 ( - 49 )} : - \frac{5 ( 809 - 5 )}{49}

x = \frac{- 50 - 10 809}{2 ( - 49 )} : \frac{5 ( 5 + 809 )}{49}

二次equationの解:

x = - \frac{5 ( 809 - 5 )}{49}, x = \frac{5 ( 5 + 809 )}{49}

グラフ

人気の例

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