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人気のある代数 >

3x^2-9x(2x+2)+4=7

解

3 x^{2} - 9 x (2 x + 2) + 4 = 7

解

x = - 1, x = - \frac{1}{5}

+1

十進法表記

x = - 1, x = - 0.2

解答ステップ

3 x^{2} - 9 x (2 x + 2) + 4 = 7

拡張

3 x^{2} - 9 x (2 x + 2) + 4 : - 15 x^{2} - 18 x + 4

- 15 x^{2} - 18 x + 4 = 7

7

を左側に移動します

- 15 x^{2} - 18 x - 3 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 18 ) \pm ( - 18 ) ^{2} - 4 ( - 15 ) ( - 3 )}{2 ( - 15 )}

(- 18)^{2} - 4 (- 15) (- 3) = 12

x_{1, 2} = \frac{- ( - 18 ) \pm 12}{2 ( - 15 )}

解を分離する

x_{1} = \frac{- ( - 18 ) + 12}{2 ( - 15 )}, x_{2} = \frac{- ( - 18 ) - 12}{2 ( - 15 )}

x = \frac{- ( - 18 ) + 12}{2 ( - 15 )} : - 1

x = \frac{- ( - 18 ) - 12}{2 ( - 15 )} : - \frac{1}{5}

二次equationの解:

x = - 1, x = - \frac{1}{5}

グラフ

人気の例

(x - 6) (x + 1) = 0

solvefor y,(x+y)^2+(x-y)^2=x^3+y^2

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

x^{2} + 5 x + 15 = 0

(x + 2)^{2} - 5 = 19

solvefor x,-x^2+2xy-1=0

so l v e f or x, - x^{2} + 2 x y - 1 = 0