8x^2+56x=0

解

8 x^{2} + 56 x = 0

x = 0, x = - 7

解答ステップ

8 x^{2} + 56 x = 0

解くとthe二次式

x_{1, 2} = \frac{- 56 \pm 5 6 ^{2} - 4 \cdot 8 \cdot 0}{2 \cdot 8}

5 6^{2} - 4 \cdot 8 \cdot 0 = 56

x_{1, 2} = \frac{- 56 \pm 56}{2 \cdot 8}

解を分離する

x_{1} = \frac{- 56 + 56}{2 \cdot 8}, x_{2} = \frac{- 56 - 56}{2 \cdot 8}

x = \frac{- 56 + 56}{2 \cdot 8} : 0

x = \frac{- 56 - 56}{2 \cdot 8} : - 7

二次equationの解:

x = 0, x = - 7