-x^2-9x+22=0

解答

- x^{2} - 9 x + 22 = 0

x = - 11, x = 2

求解步骤

- x^{2} - 9 x + 22 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 ( - 1 ) \cdot 22}{2 ( - 1 )}

(- 9)^{2} - 4 (- 1) \cdot 22 = 13

x_{1, 2} = \frac{- ( - 9 ) \pm 13}{2 ( - 1 )}

将解分隔开

x_{1} = \frac{- ( - 9 ) + 13}{2 ( - 1 )}, x_{2} = \frac{- ( - 9 ) - 13}{2 ( - 1 )}

x = \frac{- ( - 9 ) + 13}{2 ( - 1 )} : - 11

x = \frac{- ( - 9 ) - 13}{2 ( - 1 )} : 2

二次方程组的解是:

x = - 11, x = 2

- 0.2 (q - 25)^{2} + 165 = - 2 q + 140

so l v e f or x, x^{2} + y^{3} = 3 x y + 2

4200 = x^{2} - 160 x + 10000

x^{2} + 4 x - 72 = 0

x^{2} - \frac{1}{3} x - \frac{4}{9} = 0