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人気のある代数 >

-0.3x^2-3.5x+20=0

解

- 0.3 x^{2} - 3.5 x + 20 = 0

解

x = - \frac{35 + 5 145}{6}, x = \frac{5 145 - 35}{6}

+1

十進法表記

x = - 15.86799 \dots, x = 4.20132 \dots

解答ステップ

- 0.3 x^{2} - 3.5 x + 20 = 0

以下で両辺を乗じる:

10

- 3 x^{2} - 35 x + 200 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 35 ) \pm ( - 35 ) ^{2} - 4 ( - 3 ) \cdot 200}{2 ( - 3 )}

(- 35)^{2} - 4 (- 3) \cdot 200 = 5145

x_{1, 2} = \frac{- ( - 35 ) \pm 5 145}{2 ( - 3 )}

解を分離する

x_{1} = \frac{- ( - 35 ) + 5 145}{2 ( - 3 )}, x_{2} = \frac{- ( - 35 ) - 5 145}{2 ( - 3 )}

x = \frac{- ( - 35 ) + 5 145}{2 ( - 3 )} : - \frac{35 + 5 145}{6}

x = \frac{- ( - 35 ) - 5 145}{2 ( - 3 )} : \frac{5 145 - 35}{6}

二次equationの解:

x = - \frac{35 + 5 145}{6}, x = \frac{5 145 - 35}{6}

グラフ

人気の例

completesquare-y^2-2y

co m pl e t es q u a re - y^{2} - 2 y

6750000=100x-0.0001x^2

6750000 = 100 x - 0.0001 x^{2}

solvefor x,100^2+130^2=x^2

so l v e f or x, 10 0^{2} + 13 0^{2} = x^{2}

9 d^{2} + 12 d + 1 = - 3

(5x^2+3)/4-(17-x^2)/2 =8

\frac{5 x ^{2} + 3}{4} - \frac{17 - x ^{2}}{2} = 8