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 2x^2-6x+4=0

解答

2 x^{2} - 6 x + 4 = 0

解答

x = 2, x = 1

求解步骤

2 x^{2} - 6 x + 4 = 0

将

4

到右边

2 x^{2} - 6 x = - 4

两边除以

2

\frac{2 x ^{2} - 6 x}{2} = \frac{- 4}{2}

x^{2} - 3 x = - 2

改写为形式

(x + a)^{2} = b

(x - \frac{3}{2})^{2} = \frac{1}{4}

若

f^{2} (x) = a

，解为

f (x) = a, - a

解

x - \frac{3}{2} = \frac{1}{4} : x = 2

解

x - \frac{3}{2} = - \frac{1}{4} : x = 1

二次方程组的解是:

x = 2, x = 1

作图

流行的例子

- 4 x^{2} + 11 x - 6 = 0

x = (1 - x)^{2}

a^{2} - 4 a = 21

L(p)=-4000p^2+66000p-140000

L (p) = - 4000 p^{2} + 66000 p - 140000

3x-2=2(x-3)(2x-2)

3 x - 2 = 2 (x - 3) (2 x - 2)