-x^2+20x-36=0

解

- x^{2} + 20 x - 36 = 0

x = 2, x = 18

解答ステップ

- x^{2} + 20 x - 36 = 0

解くとthe二次式

x_{1, 2} = \frac{- 20 \pm 2 0 ^{2} - 4 ( - 1 ) ( - 36 )}{2 ( - 1 )}

2 0^{2} - 4 (- 1) (- 36) = 16

x_{1, 2} = \frac{- 20 \pm 16}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- 20 + 16}{2 ( - 1 )}, x_{2} = \frac{- 20 - 16}{2 ( - 1 )}

x = \frac{- 20 + 16}{2 ( - 1 )} : 2

x = \frac{- 20 - 16}{2 ( - 1 )} : 18

二次equationの解:

x = 2, x = 18