x^2+7x=0

解

x^{2} + 7 x = 0

x = 0, x = - 7

解答ステップ

x^{2} + 7 x = 0

解くとthe二次式

x_{1, 2} = \frac{- 7 \pm 7 ^{2} - 4 \cdot 1 \cdot 0}{2 \cdot 1}

7^{2} - 4 \cdot 1 \cdot 0 = 7

x_{1, 2} = \frac{- 7 \pm 7}{2 \cdot 1}

解を分離する

x_{1} = \frac{- 7 + 7}{2 \cdot 1}, x_{2} = \frac{- 7 - 7}{2 \cdot 1}

x = \frac{- 7 + 7}{2 \cdot 1} : 0

x = \frac{- 7 - 7}{2 \cdot 1} : - 7

二次equationの解:

x = 0, x = - 7