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人気のある代数 >

-x^2+21x-74=0

解

- x^{2} + 21 x - 74 = 0

解

x = \frac{21 - 145}{2}, x = \frac{21 + 145}{2}

+1

十進法表記

x = 4.47920 \dots, x = 16.52079 \dots

解答ステップ

- x^{2} + 21 x - 74 = 0

解くとthe二次式

x_{1, 2} = \frac{- 21 \pm 2 1 ^{2} - 4 ( - 1 ) ( - 74 )}{2 ( - 1 )}

2 1^{2} - 4 (- 1) (- 74) = 145

x_{1, 2} = \frac{- 21 \pm 145}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- 21 + 145}{2 ( - 1 )}, x_{2} = \frac{- 21 - 145}{2 ( - 1 )}

x = \frac{- 21 + 145}{2 ( - 1 )} : \frac{21 - 145}{2}

x = \frac{- 21 - 145}{2 ( - 1 )} : \frac{21 + 145}{2}

二次equationの解:

x = \frac{21 - 145}{2}, x = \frac{21 + 145}{2}

グラフ

人気の例

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