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+7)(x-2)=10

解答

(x + 7) (x - 2) = 10

解答

x = 3, x = - 8

求解步骤

(x + 7) (x - 2) = 10

展开

(x + 7) (x - 2) : x^{2} + 5 x - 14

x^{2} + 5 x - 14 = 10

将

10

para o lado esquerdo

x^{2} + 5 x - 24 = 0

使用求根公式求解

x_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 \cdot 1 \cdot ( - 24 )}{2 \cdot 1}

5^{2} - 4 \cdot 1 \cdot (- 24) = 11

x_{1, 2} = \frac{- 5 \pm 11}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 5 + 11}{2 \cdot 1}, x_{2} = \frac{- 5 - 11}{2 \cdot 1}

x = \frac{- 5 + 11}{2 \cdot 1} : 3

x = \frac{- 5 - 11}{2 \cdot 1} : - 8

二次方程组的解是:

x = 3, x = - 8

作图

流行的例子

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

x^{2} = 18 - 3 x

2000+5x^2-200x=185.71

2000 + 5 x^{2} - 200 x = 185.71

x^2-3x+2=0,(1,-1,2,-2)

x^{2} - 3 x + 2 = 0, (1, - 1, 2, - 2)

2 m^{2} + 8 m + 8 = 0