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人気のある代数 >

7-x^2=x

解

7 - x^{2} = x

解

x = - \frac{1 + 29}{2}, x = \frac{29 - 1}{2}

+1

十進法表記

x = - 3.19258 \dots, x = 2.19258 \dots

解答ステップ

7 - x^{2} = x

x

を左側に移動します

7 - x^{2} - x = 0

標準的な形式で書く

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

- x^{2} - x + 7 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 1 ) \pm ( - 1 ) ^{2} - 4 ( - 1 ) \cdot 7}{2 ( - 1 )}

(- 1)^{2} - 4 (- 1) \cdot 7 = 29

x_{1, 2} = \frac{- ( - 1 ) \pm 29}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- ( - 1 ) + 29}{2 ( - 1 )}, x_{2} = \frac{- ( - 1 ) - 29}{2 ( - 1 )}

x = \frac{- ( - 1 ) + 29}{2 ( - 1 )} : - \frac{1 + 29}{2}

x = \frac{- ( - 1 ) - 29}{2 ( - 1 )} : \frac{29 - 1}{2}

二次equationの解:

x = - \frac{1 + 29}{2}, x = \frac{29 - 1}{2}

グラフ

人気の例

x^{2} + 22 x = 8 x - 53

(x(x+1))/2 =120

\frac{x ( x + 1 )}{2} = 120

x^{2} - 37 x + 27 = 0

7 x^{2} - 66 x + 27 = 0

x^2+(x+5)^2=5+16(3-x)

x^{2} + (x + 5)^{2} = 5 + 16 (3 - x)