x^2+18x+17=0

解

x^{2} + 18 x + 17 = 0

x = - 1, x = - 17

解答ステップ

x^{2} + 18 x + 17 = 0

解くとthe二次式

x_{1, 2} = \frac{- 18 \pm 1 8 ^{2} - 4 \cdot 1 \cdot 17}{2 \cdot 1}

1 8^{2} - 4 \cdot 1 \cdot 17 = 16

x_{1, 2} = \frac{- 18 \pm 16}{2 \cdot 1}

解を分離する

x_{1} = \frac{- 18 + 16}{2 \cdot 1}, x_{2} = \frac{- 18 - 16}{2 \cdot 1}

x = \frac{- 18 + 16}{2 \cdot 1} : - 1

x = \frac{- 18 - 16}{2 \cdot 1} : - 17

二次equationの解:

x = - 1, x = - 17