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人気のある代数 >

c(x)=120x-40x^2

解

c (x) = 120 x - 40 x^{2}

解

x = 0, x = \frac{120 - c}{40}

解答ステップ

c (x) = 120 x - 40 x^{2}

改良

c x = 120 x - 40 x^{2}

辺を交換する

120 x - 40 x^{2} = c x

c x

を左側に移動します

120 x - 40 x^{2} - c x = 0

標準的な形式で書く

a x^{2} + b x + c = 0

- 40 x^{2} + (120 - c) x = 0

解くとthe二次式

x_{1, 2} = \frac{- ( 120 - c ) \pm ( 120 - c ) ^{2} - 4 ( - 40 ) \cdot 0}{2 ( - 40 )}

簡素化

(120 - c)^{2} - 4 (- 40) \cdot 0 : - c + 120

x_{1, 2} = \frac{- ( 120 - c ) \pm ( - c + 120 )}{2 ( - 40 )}

解を分離する

x_{1} = \frac{- ( 120 - c ) - c + 120}{2 ( - 40 )}, x_{2} = \frac{- ( 120 - c ) - ( - c + 120 )}{2 ( - 40 )}

x = \frac{- ( 120 - c ) - c + 120}{2 ( - 40 )} : 0

x = \frac{- ( 120 - c ) - ( - c + 120 )}{2 ( - 40 )} : \frac{120 - c}{40}

二次equationの解:

x = 0, x = \frac{120 - c}{40}

グラフ

人気の例

completesquare x^2+4x-9

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completesquare x^2+4x-8

co m pl e t es q u a re x^{2} + 4 x - 8

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- x^{2} + 72 x = - 216 - 7 x^{2}

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