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 >

completesquare x^2+14x+43=0

解答

x^{2} + 14 x + 43 = 0

解答

x = 6 - 7, x = - 6 - 7

+1

十进制

x = - 4.55051 \dots, x = - 9.44948 \dots

求解步骤

x^{2} + 14 x + 43 = 0

将

43

到右边

x^{2} + 14 x = - 43

改写为形式

(x + a)^{2} = b

(x + 7)^{2} = 6

若

f^{2} (x) = a

，解为

f (x) = a, - a

解

x + 7 = 6 : x = 6 - 7

解

x + 7 = - 6 : x = - 6 - 7

二次方程组的解是:

x = 6 - 7, x = - 6 - 7

作图

流行的例子

x (x - 9) = 5

a^{2} - 4 a + 20 = 0

3x^2+6x+8+7x^2-3x=9

3 x^{2} + 6 x + 8 + 7 x^{2} - 3 x = 9

5x^2+70000x-6000=6000

5 x^{2} + 70000 x - 6000 = 6000

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