-x^2-12x-27=0

解

- x^{2} - 12 x - 27 = 0

x = - 9, x = - 3

解答ステップ

- x^{2} - 12 x - 27 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 12 ) \pm ( - 12 ) ^{2} - 4 ( - 1 ) ( - 27 )}{2 ( - 1 )}

(- 12)^{2} - 4 (- 1) (- 27) = 6

x_{1, 2} = \frac{- ( - 12 ) \pm 6}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- ( - 12 ) + 6}{2 ( - 1 )}, x_{2} = \frac{- ( - 12 ) - 6}{2 ( - 1 )}

x = \frac{- ( - 12 ) + 6}{2 ( - 1 )} : - 9

x = \frac{- ( - 12 ) - 6}{2 ( - 1 )} : - 3

二次equationの解:

x = - 9, x = - 3