-8x^2-16x=0

解

- 8 x^{2} - 16 x = 0

x = - 2, x = 0

解答ステップ

- 8 x^{2} - 16 x = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 16 ) \pm ( - 16 ) ^{2} - 4 ( - 8 ) \cdot 0}{2 ( - 8 )}

(- 16)^{2} - 4 (- 8) \cdot 0 = 16

x_{1, 2} = \frac{- ( - 16 ) \pm 16}{2 ( - 8 )}

解を分離する

x_{1} = \frac{- ( - 16 ) + 16}{2 ( - 8 )}, x_{2} = \frac{- ( - 16 ) - 16}{2 ( - 8 )}

x = \frac{- ( - 16 ) + 16}{2 ( - 8 )} : - 2

x = \frac{- ( - 16 ) - 16}{2 ( - 8 )} : 0

二次equationの解:

x = - 2, x = 0