7x^2+63x=0

解

7 x^{2} + 63 x = 0

x = 0, x = - 9

解答ステップ

7 x^{2} + 63 x = 0

解くとthe二次式

x_{1, 2} = \frac{- 63 \pm 6 3 ^{2} - 4 \cdot 7 \cdot 0}{2 \cdot 7}

6 3^{2} - 4 \cdot 7 \cdot 0 = 63

x_{1, 2} = \frac{- 63 \pm 63}{2 \cdot 7}

解を分離する

x_{1} = \frac{- 63 + 63}{2 \cdot 7}, x_{2} = \frac{- 63 - 63}{2 \cdot 7}

x = \frac{- 63 + 63}{2 \cdot 7} : 0

x = \frac{- 63 - 63}{2 \cdot 7} : - 9

二次equationの解:

x = 0, x = - 9