-2x^2-6x=0

解

- 2 x^{2} - 6 x = 0

x = - 3, x = 0

解答ステップ

- 2 x^{2} - 6 x = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 6 ) \pm ( - 6 ) ^{2} - 4 ( - 2 ) \cdot 0}{2 ( - 2 )}

(- 6)^{2} - 4 (- 2) \cdot 0 = 6

x_{1, 2} = \frac{- ( - 6 ) \pm 6}{2 ( - 2 )}

解を分離する

x_{1} = \frac{- ( - 6 ) + 6}{2 ( - 2 )}, x_{2} = \frac{- ( - 6 ) - 6}{2 ( - 2 )}

x = \frac{- ( - 6 ) + 6}{2 ( - 2 )} : - 3

x = \frac{- ( - 6 ) - 6}{2 ( - 2 )} : 0

二次equationの解:

x = - 3, x = 0