x^2+17x+66=0

解

x^{2} + 17 x + 66 = 0

x = - 6, x = - 11

解答ステップ

x^{2} + 17 x + 66 = 0

解くとthe二次式

x_{1, 2} = \frac{- 17 \pm 1 7 ^{2} - 4 \cdot 1 \cdot 66}{2 \cdot 1}

1 7^{2} - 4 \cdot 1 \cdot 66 = 5

x_{1, 2} = \frac{- 17 \pm 5}{2 \cdot 1}

解を分離する

x_{1} = \frac{- 17 + 5}{2 \cdot 1}, x_{2} = \frac{- 17 - 5}{2 \cdot 1}

x = \frac{- 17 + 5}{2 \cdot 1} : - 6

x = \frac{- 17 - 5}{2 \cdot 1} : - 11

二次equationの解:

x = - 6, x = - 11