x^2+5x-66=0

解

x^{2} + 5 x - 66 = 0

x = 6, x = - 11

解答ステップ

x^{2} + 5 x - 66 = 0

解くとthe二次式

x_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 \cdot 1 \cdot ( - 66 )}{2 \cdot 1}

5^{2} - 4 \cdot 1 \cdot (- 66) = 17

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

解を分離する

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

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

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

二次equationの解:

x = 6, x = - 11