x^2+86x+168=0

解

x^{2} + 86 x + 168 = 0

x = - 2, x = - 84

解答ステップ

x^{2} + 86 x + 168 = 0

解くとthe二次式

x_{1, 2} = \frac{- 86 \pm 8 6 ^{2} - 4 \cdot 1 \cdot 168}{2 \cdot 1}

8 6^{2} - 4 \cdot 1 \cdot 168 = 82

x_{1, 2} = \frac{- 86 \pm 82}{2 \cdot 1}

解を分離する

x_{1} = \frac{- 86 + 82}{2 \cdot 1}, x_{2} = \frac{- 86 - 82}{2 \cdot 1}

x = \frac{- 86 + 82}{2 \cdot 1} : - 2

x = \frac{- 86 - 82}{2 \cdot 1} : - 84

二次equationの解:

x = - 2, x = - 84