x^2-11x+18=0

解

x^{2} - 11 x + 18 = 0

x = 9, x = 2

解答ステップ

x^{2} - 11 x + 18 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 11 ) \pm ( - 11 ) ^{2} - 4 \cdot 1 \cdot 18}{2 \cdot 1}

(- 11)^{2} - 4 \cdot 1 \cdot 18 = 7

x_{1, 2} = \frac{- ( - 11 ) \pm 7}{2 \cdot 1}

解を分離する

x_{1} = \frac{- ( - 11 ) + 7}{2 \cdot 1}, x_{2} = \frac{- ( - 11 ) - 7}{2 \cdot 1}

x = \frac{- ( - 11 ) + 7}{2 \cdot 1} : 9

x = \frac{- ( - 11 ) - 7}{2 \cdot 1} : 2

二次equationの解:

x = 9, x = 2