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人気のある代数 >

-x^2+320x-25.6=0

解

- x^{2} + 320 x - 25.6 = 0

解

x = \frac{8 ( 100 - 3 1110 )}{5}, x = \frac{8 ( 100 + 3 1110 )}{5}

+1

十進法表記

x = 0.08002 \dots, x = 319.91997 \dots

解答ステップ

- x^{2} + 320 x - 25.6 = 0

以下で両辺を乗じる:

10

- 10 x^{2} + 3200 x - 256 = 0

解くとthe二次式

x_{1, 2} = \frac{- 3200 \pm 320 0 ^{2} - 4 ( - 10 ) ( - 256 )}{2 ( - 10 )}

320 0^{2} - 4 (- 10) (- 256) = 961110

x_{1, 2} = \frac{- 3200 \pm 96 1110}{2 ( - 10 )}

解を分離する

x_{1} = \frac{- 3200 + 96 1110}{2 ( - 10 )}, x_{2} = \frac{- 3200 - 96 1110}{2 ( - 10 )}

x = \frac{- 3200 + 96 1110}{2 ( - 10 )} : \frac{8 ( 100 - 3 1110 )}{5}

x = \frac{- 3200 - 96 1110}{2 ( - 10 )} : \frac{8 ( 100 + 3 1110 )}{5}

二次equationの解:

x = \frac{8 ( 100 - 3 1110 )}{5}, x = \frac{8 ( 100 + 3 1110 )}{5}

グラフ

人気の例

x^{2} + 8 x + 80 = 0

completesquare x^2-2x-2=0

co m pl e t es q u a re x^{2} - 2 x - 2 = 0

completesquare 4x^2+10x-3=0

co m pl e t es q u a re 4 x^{2} + 10 x - 3 = 0

x^{2} + 6 x + 21 = 0

x^2=7(4/5 x-10)

x^{2} = 7 (\frac{4}{5} x - 10)