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人気のある代数 >

0=-0.525x^2+2.1x+1.9

解

0 = - 0.525 x^{2} + 2.1 x + 1.9

解

x = - \frac{2 ( 2 210 - 21 )}{21}, x = \frac{2 ( 21 + 2 210 )}{21}

+1

十進法表記

x = - 0.76026 \dots, x = 4.76026 \dots

解答ステップ

0 = - 0.525 x^{2} + 2.1 x + 1.9

以下で両辺を乗じる:

1000

0 = - 525 x^{2} + 2100 x + 1900

辺を交換する

- 525 x^{2} + 2100 x + 1900 = 0

解くとthe二次式

x_{1, 2} = \frac{- 2100 \pm 210 0 ^{2} - 4 ( - 525 ) \cdot 1900}{2 ( - 525 )}

210 0^{2} - 4 (- 525) \cdot 1900 = 200210

x_{1, 2} = \frac{- 2100 \pm 200 210}{2 ( - 525 )}

解を分離する

x_{1} = \frac{- 2100 + 200 210}{2 ( - 525 )}, x_{2} = \frac{- 2100 - 200 210}{2 ( - 525 )}

x = \frac{- 2100 + 200 210}{2 ( - 525 )} : - \frac{2 ( 2 210 - 21 )}{21}

x = \frac{- 2100 - 200 210}{2 ( - 525 )} : \frac{2 ( 21 + 2 210 )}{21}

二次equationの解:

x = - \frac{2 ( 2 210 - 21 )}{21}, x = \frac{2 ( 21 + 2 210 )}{21}

グラフ

人気の例

12 x^{2} - 16 x = 0

x = x^{2} + 5 x - 5

x^{2} + 1.5 x + 0.5 = 0

x^2-1= 1/2 x+1/2

x^{2} - 1 = \frac{1}{2} x + \frac{1}{2}

2 x^{2} - 6 x = - 3