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人気のある代数 >

-x^2-7x=-18

解

- x^{2} - 7 x = - 18

解

x = - 9, x = 2

解答ステップ

- x^{2} - 7 x = - 18

18

を左側に移動します

- x^{2} - 7 x + 18 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 7 ) \pm ( - 7 ) ^{2} - 4 ( - 1 ) \cdot 18}{2 ( - 1 )}

(- 7)^{2} - 4 (- 1) \cdot 18 = 11

x_{1, 2} = \frac{- ( - 7 ) \pm 11}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- ( - 7 ) + 11}{2 ( - 1 )}, x_{2} = \frac{- ( - 7 ) - 11}{2 ( - 1 )}

x = \frac{- ( - 7 ) + 11}{2 ( - 1 )} : - 9

x = \frac{- ( - 7 ) - 11}{2 ( - 1 )} : 2

二次equationの解:

x = - 9, x = 2

グラフ

人気の例

x^2+10x+25/2 =0

x^{2} + 10 x + \frac{25}{2} = 0

t^{2} = 5 t - 6

2808.8=0.68*2.14*100*x*(9.5-0.4*x)

2808.8 = 0.68 \cdot 2.14 \cdot 100 \cdot x \cdot (9.5 - 0.4 \cdot x)

2x^2-2x+3=x^2-3x+2

2 x^{2} - 2 x + 3 = x^{2} - 3 x + 2

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

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