-x^2+9x-8=0

解

- x^{2} + 9 x - 8 = 0

x = 1, x = 8

解答ステップ

- x^{2} + 9 x - 8 = 0

解くとthe二次式

x_{1, 2} = \frac{- 9 \pm 9 ^{2} - 4 ( - 1 ) ( - 8 )}{2 ( - 1 )}

9^{2} - 4 (- 1) (- 8) = 7

x_{1, 2} = \frac{- 9 \pm 7}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- 9 + 7}{2 ( - 1 )}, x_{2} = \frac{- 9 - 7}{2 ( - 1 )}

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

x = \frac{- 9 - 7}{2 ( - 1 )} : 8

二次equationの解:

x = 1, x = 8