zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

x^2+23x-78=0

解答

x^{2} + 23 x - 78 = 0

解答

x = 3, x = - 26

求解步骤

x^{2} + 23 x - 78 = 0

使用求根公式求解

x_{1, 2} = \frac{- 23 \pm 2 3 ^{2} - 4 \cdot 1 \cdot ( - 78 )}{2 \cdot 1}

2 3^{2} - 4 \cdot 1 \cdot (- 78) = 29

x_{1, 2} = \frac{- 23 \pm 29}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 23 + 29}{2 \cdot 1}, x_{2} = \frac{- 23 - 29}{2 \cdot 1}

x = \frac{- 23 + 29}{2 \cdot 1} : 3

x = \frac{- 23 - 29}{2 \cdot 1} : - 26

二次方程组的解是:

x = 3, x = - 26

作图

流行的例子

8 p^{2} + 14 p - 9 = 6

4 y^{2} + 25 = - 20 y

2 (x + 4)^{2} + 44 = 46

- 4 x^{2} + 3 x + 8 = 0

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