-x^2+120x-2975=0

解

- x^{2} + 120 x - 2975 = 0

x = 35, x = 85

解答ステップ

- x^{2} + 120 x - 2975 = 0

解くとthe二次式

x_{1, 2} = \frac{- 120 \pm 12 0 ^{2} - 4 ( - 1 ) ( - 2975 )}{2 ( - 1 )}

12 0^{2} - 4 (- 1) (- 2975) = 50

x_{1, 2} = \frac{- 120 \pm 50}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- 120 + 50}{2 ( - 1 )}, x_{2} = \frac{- 120 - 50}{2 ( - 1 )}

x = \frac{- 120 + 50}{2 ( - 1 )} : 35

x = \frac{- 120 - 50}{2 ( - 1 )} : 85

二次equationの解:

x = 35, x = 85