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人気のある代数 >

-x^2+20.5x-100=0

解

- x^{2} + 20.5 x - 100 = 0

解

x = 8, x = \frac{25}{2}

+1

十進法表記

x = 8, x = 12.5

解答ステップ

- x^{2} + 20.5 x - 100 = 0

以下で両辺を乗じる:

10

- 10 x^{2} + 205 x - 1000 = 0

解くとthe二次式

x_{1, 2} = \frac{- 205 \pm 20 5 ^{2} - 4 ( - 10 ) ( - 1000 )}{2 ( - 10 )}

20 5^{2} - 4 (- 10) (- 1000) = 45

x_{1, 2} = \frac{- 205 \pm 45}{2 ( - 10 )}

解を分離する

x_{1} = \frac{- 205 + 45}{2 ( - 10 )}, x_{2} = \frac{- 205 - 45}{2 ( - 10 )}

x = \frac{- 205 + 45}{2 ( - 10 )} : 8

x = \frac{- 205 - 45}{2 ( - 10 )} : \frac{25}{2}

二次equationの解:

x = 8, x = \frac{25}{2}

グラフ

人気の例

x^2-(3sqrt(2)+2i)*x+6sqrt(2i)=0

x^{2} - (32 + 2 i) \cdot x + 6 2 i = 0

a^{2} \cdot x^{2} - b^{2} = 0

solvefor x,x^2+y^2+z^2-4x+6y+2z-2=0

so l v e f or x, x^{2} + y^{2} + z^{2} - 4 x + 6 y + 2 z - 2 = 0

solvefor x,x^2y+2xy=5y^3

so l v e f or x, x^{2} y + 2 x y = 5 y^{3}

solvefor f,r^2=2f^2+2f

so l v e f or f, r^{2} = 2 f^{2} + 2 f