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 >

-2x^2+10x-8=0

解答

- 2 x^{2} + 10 x - 8 = 0

解答

x = 1, x = 4

求解步骤

- 2 x^{2} + 10 x - 8 = 0

使用求根公式求解

x_{1, 2} = \frac{- 10 \pm 1 0 ^{2} - 4 ( - 2 ) ( - 8 )}{2 ( - 2 )}

1 0^{2} - 4 (- 2) (- 8) = 6

x_{1, 2} = \frac{- 10 \pm 6}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- 10 + 6}{2 ( - 2 )}, x_{2} = \frac{- 10 - 6}{2 ( - 2 )}

x = \frac{- 10 + 6}{2 ( - 2 )} : 1

x = \frac{- 10 - 6}{2 ( - 2 )} : 4

二次方程组的解是:

x = 1, x = 4

作图

流行的例子

(a - 4)^{2} = 16

1+x^2=(37/35)^2

1 + x^{2} = (\frac{37}{35})^{2}

9 x^{2} + 28 x + 50 = 0

A=(x+8)^2+(x-8)^2-(x+2)(x-2)

A = (x + 8)^{2} + (x - 8)^{2} - (x + 2) (x - 2)

2x^2-2x-30=-2x^2-19

2 x^{2} - 2 x - 30 = - 2 x^{2} - 19